67-72 Electric speedo - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ls1nova71 · 03-06-2012, 12:05 AM

This is my 120mph electric speedo mod for 67-72 trucks. I got the idea from another member on here, brad_man_72, when I saw his truck at the All Truck Nationals several years ago. He had it in his truck, but it wasn't working. I took the ball and ran with it.

What it is, is the guts from a '96-7 S-10. They made two speedos in those trucks, one with a tach and one without. You need the one without the tach. The S-10 speedo goes from 0 to 100mph, but the numbers start at what would be the 8 o'clock position and go to the 4 o'clock position. 67-72 trucks, the 0mph is at the 7 o'clock position and goes to the 5 o'clock position, so for it to work right and to have the exact same sweep, the needle needed to be put on in the 7 o'clock position, but what that does is put the 100mph mark at 3 o'clock, so I added 110 and 120 to even everything out. I had a new face made up that has the correct lines on it, one for every 10 mph, and then had a "mask" made to be able to repaint on the numbers on the lens.

Mounting the guts behind the original face is probably the hardest part. Actually using the original face didn't work out as well as just using the S-10 face and putting the new face I had made right on top of it. Once I put the new face on, I cut out the odometer and trip odometer holes. I had to move a couple of the dash light bulbs, and I did away with the printed circut and just hard wired them with a plug so I can unplug the whole cluster to remove it. I also put a small red LED in the factory spot for the high beam indicator.

You wouldn't need to keep the trip odometerm but I figured since it was there I would try and keep it. It is just barely noticeable, but the reset knob is just to the right of the speedo in the bezel.

The pics here are of it when I was working on it, it's not done in the pics and I have since had the lines on the face changed to more of a greenish tint to match the other gauges because the first ones looked too white next to them.

I have tested this speedo by hooking it up to my 2003 Sunfire, and it was right on with what the sunfire speedo read, so I know it's going to work when I get my truck on the road.

gringoloco · 03-06-2012, 12:11 AM

Very nice! Can you go into more detail about where you got the printing done?

ls1nova71 · 03-06-2012, 12:42 AM

Quote:

Originally Posted by gringoloco

Very nice! Can you go into more detail about where you got the printing done?

It was a local sign printing place, but I had to go to a graphics design place that the printer reccomended to get the face "redesigned" because he doesn't have the ability to do that part. That was the most expensive part of the whole thing.

ls1nova71 · 03-06-2012, 12:13 AM

more pics

ls1nova71 · 03-06-2012, 12:20 AM

more

ls1nova71 · 03-06-2012, 12:27 AM

more

ls1nova71 · 03-06-2012, 12:34 AM

and more

ls1nova71 · 03-06-2012, 12:39 AM

more

Shon · 03-06-2012, 09:33 AM

Very cool!

**Clyde65** · 03-06-2012, 10:34 AM

Genius!

henry3rd · 03-06-2012, 01:02 PM

That is great work man!

BustedTruck · 03-14-2012, 10:25 PM

Excellent work. I am going to do this.

nomrlz · 03-15-2012, 08:54 AM

one of the coolest ideas and execution i've seen in awhile

Dustytrix · 05-04-2012, 09:45 PM

Great job, I love these diy jobs, make it work.

ls1nova71 · 08-29-2012, 11:41 PM

Thought I'd post a quick update. I had the tune in my truck finalized yesterday, and now the speedo is dead on the money! I drove the truck to my buddy's house in Topeka, and when he was done with it, driving it home, the speedo was within 1 mph of what my GPS was saying. I clocked the odometer by the mile markers on the turnpike, and with every 1 mile on the odometer was 1 mile exactly with the markers. And the needle is SMOOTH! Not at all jumpy like the original speedo, or with a Cable-X.

I'm putting together another one for my beater truck (avatar pic) that's getting a 5.3 4l60e swap real soon!

cjohnson6772 · 08-29-2012, 11:46 PM

Quote:

Originally Posted by ls1nova71

Thought I'd post a quick update. I had the tune in my truck finalized yesterday, and now the speedo is dead on the money! I drove the truck to my buddy's house in Topeka, and when he was done with it, driving it home, the speedo was within 1 mph of what my GPS was saying. I clocked the odometer by the mile markers on the turnpike, and with every 1 mile on the odometer was 1 mile exactly with the markers. And the needle is SMOOTH! Not at all jumpy like the original speedo, or with a Cable-X.

I'm putting together another one for my beater truck (avatar pic) that's getting a 5.3 4l60e swap real soon!

Very impressed man. I hate to be that guy, but I guess I will: any interest in making one for me?

sprint_9 · 01-22-2013, 01:28 AM

Quote:

Originally Posted by ls1nova71

Thought I'd post a quick update. I had the tune in my truck finalized yesterday, and now the speedo is dead on the money! I drove the truck to my buddy's house in Topeka, and when he was done with it, driving it home, the speedo was within 1 mph of what my GPS was saying.

What did you have to have done as far as a tune to get it to read properly?

5150 · 08-30-2012, 01:22 AM

I'm not ashamed to be that guy, any interest in making more of these? I have a 5.3 4L60E going in my burb.

y5mgisi · 12-20-2012, 01:37 AM

Found this from your thread on ls1tech. Incredible work!

**LEEVON** · 12-20-2012, 02:48 AM

You should see the next one he built...

cjohnson6772 · 12-20-2012, 01:44 PM

Quote:

Originally Posted by LEEVON

You should see the next one he built...

Link?
Posted via Mobile Device

**LEEVON** · 12-20-2012, 03:29 PM

Gotta see it in real life, I think. At the speed he builds, I'm not sure Eric has time to mess with all the pictures and posting. Imagine the blue one only orange and white and badder-asser.

ls1nova71 · 12-20-2012, 09:35 PM

Quote:

Originally Posted by y5mgisi

Found this from your thread on ls1tech. Incredible work!

Thanks!

Quote:

Originally Posted by LEEVON

You should see the next one he built...

Quote:

Originally Posted by cjohnson6772

Link?
Posted via Mobile Device

Quote:

Originally Posted by LEEVON

Gotta see it in real life, I think. At the speed he builds, I'm not sure Eric has time to mess with all the pictures and posting. Imagine the blue one only orange and white and badder-asser.

I think there's some confusion here! I posted a link to this thread on my new build thread which is where y5mgisi most likley found this. There's pics of the orange truck at the end of my blue '72 build thread. I put a link in my sig for the green truck that I'm working on now. Is that clear as mud now?

ls1nova71 · 12-20-2012, 09:58 PM

For anyone thinking about doing this, I thought I would update the pics a little bit. These are the pics of the finished cluster, the backside showing it all hard wired with no printed circut, and you can also see the plugs I put on it so I can unplug the whole cluster to remove it. The last pics are of the back tin where the speedo mounts. This is on the one I am currently working on and I changed how it's mounted, works out better this way.

ls1nova71 · 12-20-2012, 09:59 PM

The back tin.

03-06-2012, 12:05 AM	#1
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	67-72 Electric speedo This is my 120mph electric speedo mod for 67-72 trucks. I got the idea from another member on here, brad_man_72, when I saw his truck at the All Truck Nationals several years ago. He had it in his truck, but it wasn't working. I took the ball and ran with it. What it is, is the guts from a '96-7 S-10. They made two speedos in those trucks, one with a tach and one without. You need the one without the tach. The S-10 speedo goes from 0 to 100mph, but the numbers start at what would be the 8 o'clock position and go to the 4 o'clock position. 67-72 trucks, the 0mph is at the 7 o'clock position and goes to the 5 o'clock position, so for it to work right and to have the exact same sweep, the needle needed to be put on in the 7 o'clock position, but what that does is put the 100mph mark at 3 o'clock, so I added 110 and 120 to even everything out. I had a new face made up that has the correct lines on it, one for every 10 mph, and then had a "mask" made to be able to repaint on the numbers on the lens. Mounting the guts behind the original face is probably the hardest part. Actually using the original face didn't work out as well as just using the S-10 face and putting the new face I had made right on top of it. Once I put the new face on, I cut out the odometer and trip odometer holes. I had to move a couple of the dash light bulbs, and I did away with the printed circut and just hard wired them with a plug so I can unplug the whole cluster to remove it. I also put a small red LED in the factory spot for the high beam indicator. You wouldn't need to keep the trip odometerm but I figured since it was there I would try and keep it. It is just barely noticeable, but the reset knob is just to the right of the speedo in the bezel. The pics here are of it when I was working on it, it's not done in the pics and I have since had the lines on the face changed to more of a greenish tint to match the other gauges because the first ones looked too white next to them. I have tested this speedo by hooking it up to my 2003 Sunfire, and it was right on with what the sunfire speedo read, so I know it's going to work when I get my truck on the road. Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html Last edited by ls1nova71; 03-06-2012 at 12:44 AM.

03-06-2012, 12:11 AM	#2
gringoloco A guy with a truck Join Date: Sep 2005 Location: Germany, for now Posts: 5,921	Re: 67-72 Electric speedo Very nice! Can you go into more detail about where you got the printing done? __________________ -Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy

03-06-2012, 12:13 AM	#4
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo more pics Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

03-06-2012, 12:20 AM	#5
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo more Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

03-06-2012, 12:27 AM	#6
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo more Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

03-06-2012, 12:34 AM	#7
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo and more Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

03-06-2012, 12:39 AM	#8
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo more Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

03-06-2012, 09:33 AM	#9
Shon Registered User Join Date: Sep 2005 Location: sc Posts: 1,203	Re: 67-72 Electric speedo Very cool! __________________ 71 Cheyenne C10 LWB cam'd 6.0/T56 Swap

03-06-2012, 10:34 AM	#10
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,545	Re: 67-72 Electric speedo Genius! __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

03-06-2012, 01:02 PM	#11
henry3rd Registered User Join Date: Jun 2007 Location: East TN Posts: 42	Re: 67-72 Electric speedo That is great work man!

03-14-2012, 10:25 PM	#12
BustedTruck Registered User Join Date: Dec 2006 Location: Braselton, GA Posts: 245	Re: 67-72 Electric speedo Excellent work. I am going to do this.

03-15-2012, 08:54 AM	#13
nomrlz Registered User Join Date: Jan 2010 Location: Wataga,IL Posts: 666	Re: 67-72 Electric speedo one of the coolest ideas and execution i've seen in awhile __________________ 66 LWB/BBW work in progress 68 Camaro SS bigger work in progress 95 Roadmaster Wagon 12.36 @ 107.74 99 Hayabusa 8.72 @ 162 00 Hayabusa 9.33 @ 153

05-04-2012, 09:45 PM	#14
Dustytrix Registered User Join Date: Jan 2012 Location: Petal,Ms. Posts: 428	Re: 67-72 Electric speedo Great job, I love these diy jobs, make it work.

08-29-2012, 11:41 PM	#15
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo Thought I'd post a quick update. I had the tune in my truck finalized yesterday, and now the speedo is dead on the money! I drove the truck to my buddy's house in Topeka, and when he was done with it, driving it home, the speedo was within 1 mph of what my GPS was saying. I clocked the odometer by the mile markers on the turnpike, and with every 1 mile on the odometer was 1 mile exactly with the markers. And the needle is SMOOTH! Not at all jumpy like the original speedo, or with a Cable-X. I'm putting together another one for my beater truck (avatar pic) that's getting a 5.3 4l60e swap real soon! __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

08-30-2012, 01:22 AM	#18
5150 C10 Club Tennessee Join Date: Mar 2003 Location: White House, TN 37188 Posts: 8,281	Re: 67-72 Electric speedo I'm not ashamed to be that guy, any interest in making more of these? I have a 5.3 4L60E going in my burb. __________________ Bryan www.gmtruckshow.com Project "Andes"-Halen's First Truck Project: Patina Burb for he is God’s servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God’s wrath on the wrongdoer. Romans 13:4



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12-20-2012, 01:37 AM	#19
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: 67-72 Electric speedo Found this from your thread on ls1tech. Incredible work! __________________ 90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt. 77 C20 crew cab Silverado. 396/th400. In work.

12-20-2012, 02:48 AM	#20
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,888	Re: 67-72 Electric speedo You should see the next one he built... __________________ '20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids

12-20-2012, 03:29 PM	#22
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,888	Re: 67-72 Electric speedo Gotta see it in real life, I think. At the speed he builds, I'm not sure Eric has time to mess with all the pictures and posting. Imagine the blue one only orange and white and badder-asser. __________________ '20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids

12-20-2012, 09:58 PM	#24
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo For anyone thinking about doing this, I thought I would update the pics a little bit. These are the pics of the finished cluster, the backside showing it all hard wired with no printed circut, and you can also see the plugs I put on it so I can unplug the whole cluster to remove it. The last pics are of the back tin where the speedo mounts. This is on the one I am currently working on and I changed how it's mounted, works out better this way. Attached Images __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

12-20-2012, 09:59 PM	#25
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: 67-72 Electric speedo The back tin. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

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