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#476 |
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Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: 67-72 Electric speedo
I want one too!
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#477 |
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Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
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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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#478 |
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Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: 67-72 Electric speedo
So my donor car 99 Trans Am has a round pattern needle driven speedo but has a tach. Would this one work?
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#479 |
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Join Date: Jan 2019
Location: Austin, Texas
Posts: 4
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Re: 67-72 Electric speedo
67c10rusrbuket, can I get the bracket and cover? How much and how do I get the items?
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#480 |
Senior Member
![]() Join Date: Feb 2014
Location: Erie Colorado
Posts: 1,009
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Re: 67-72 Electric speedo
Alright, finally have an update on mine. I changed some things around. Instead of running a separate light for the check eninge light I used the temp light location in the gas gage by cutting out the filter of the s10. Also swap the brake warning filter. After the initial start the 60lbs oil gauge was pegging so swapped a 80lbs gauge in.
Here is the big kicker. I'm not sure I'll be able to run this set up in my truck ![]()
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#481 |
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Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: 67-72 Electric speedo
10x or 10mph?
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#482 |
Senior Member
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Location: Erie Colorado
Posts: 1,009
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Re: 67-72 Electric speedo
It's wierd because of the rate that it climbs but it is around 10 times what it should be. 0 to 100 in a second
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#483 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
I haven't messed with GenIV stuff much, but if I remember correctly, they don't have a dedicated speedo output from the ECM, it was a CAN BUS signal to the instrument cluster. They do however have an 128k ABS output that I was thinking could be programmed to work with a speedometer. I am assuming this is what you have it hooked to? Do you have a local tuner that can look at it for you? It turned out nice, would be a shame not to be able to use it.
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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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#484 | |
Senior Member
![]() Join Date: Feb 2014
Location: Erie Colorado
Posts: 1,009
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Re: 67-72 Electric speedo
Quote:
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#485 |
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Location: Durham, North Carolina
Posts: 782
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Re: 67-72 Electric speedo
I am having a similar issue, I have 00' 4.8L with 20" wheels/50 tires, 3.08 gears, and NV3500 manual trans. My speedo is about 2x what it should be (reads 90 at 45). Does this need to be adjusted with a tune due to the tall trans/gear/wheel size?
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#486 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
I'm thinking its due to a difference in speed sensors. It should be fixable in the tune though, you would have to talk to your tuner to be sure.
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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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#487 |
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Location: Durham, North Carolina
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Re: 67-72 Electric speedo
I am having it tuned Thursday so hopefully that resolves the issue. If I have the wires on the VSS backward (the pigtail I bought just had 2 black wires), would this cause the speedo to read high or would it not read at all? The pigtail on the original harness had the purple vss wire on the right so I put the right black wire to the VSS lead to my speedo so I assume it is correct but thought I would ask, thanks.
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#488 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
If those two wires are switched it wont make any difference.
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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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#489 |
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Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: 67-72 Electric speedo
Any updates for this?
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#490 |
Registered User
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
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Re: 67-72 Electric speedo
It's been quite some time since I've posted on this page, but I've still found a lot of useful info including the write up on this Speedo conversion, so thanks for that. I'm hoping I can get some help wiring this thing. I've tried to follow the picture but it's a bit difficult with all the wires bundled together. Thanks again for the write up and any help is much appreciated. The bottom picture is what I have so far.
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Eric 70 CST10 long bed in pieces also factory air and cruise(the project) 18 Silverado crew cab 5.3 4x4 My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166 |
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#491 |
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Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
It looks as though you have most of it figured out. You just need to tie the dash lights together and add ignition power, ground and a signal wire for the gas gauge. Is there something specifically you need to know?
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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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#492 |
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Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
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Re: 67-72 Electric speedo
Do I tie in the turn signal lights with the rest of the dash lights? It looks like you grounded something above the fuel gauge? I was thinking it might be easier if I wire my plug into the truck harness first and then follow it over the the gauges? The ignition power needs to run to each gauge?
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Eric 70 CST10 long bed in pieces also factory air and cruise(the project) 18 Silverado crew cab 5.3 4x4 My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166 |
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#493 | |
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Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
Quote:
You can wire the truck side first if that makes it easier for you, it doesn't matter which you do first. Yes, all the gauges that are electric will need their own ignition power.
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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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#494 | |
Registered User
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
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Re: 67-72 Electric speedo
Quote:
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Eric 70 CST10 long bed in pieces also factory air and cruise(the project) 18 Silverado crew cab 5.3 4x4 My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166 |
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#495 |
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Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
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Re: 67-72 Electric speedo
So I think I have this figured out, but I'm unsure of where the red and green wire go?
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Eric 70 CST10 long bed in pieces also factory air and cruise(the project) 18 Silverado crew cab 5.3 4x4 My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166 |
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#496 | |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: 67-72 Electric speedo
Quote:
On a more serious note... I have not done my swap yet and am out a few months due to moving etc. I am very thankful you fellas are figuring this out though. I may have missed it in here but when this is done and working right - I can still have my stock tach as well? Oh and you are very right! It's tricky! So you are right on time... ![]()
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#497 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
Yes, you can still have the factory tach, you just have to trim one side of the face of it slightly to clear the speedo. It doesn't show when installed so you will never notice it. I will look and see if I can find a pic.
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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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#498 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
You mean pink and green? There are pins that stick up on the back of the circuit board, and by them they are labeled what they go to. The pink goes to Ignition power and the green goes to Speedometer out put. If I remember correctly they are labeled IGN and SPD.
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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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#499 | |
Registered User
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
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Re: 67-72 Electric speedo
Quote:
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Eric 70 CST10 long bed in pieces also factory air and cruise(the project) 18 Silverado crew cab 5.3 4x4 My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166 |
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#500 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: 67-72 Electric speedo
I'm not sure what that wire labeled ammeter is, but I probably wouldn't use that for ignition power. The gauges will have power already going to them, so you would just need to use that wire. The speedometer wire would come from the PCM.
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