7K 73-87 tachs - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

joe231 · 04-12-2012, 08:44 PM

Quote:

Originally Posted by Jonboy

I ordered the GM Sport Salvage one a few minutes ago. Hopefully it will work in the '91 cluster.

What is a sport salvage tach?
Posted via Mobile Device

y5mgisi · 04-12-2012, 08:56 PM

Subscribed!

J Knight · 04-12-2012, 10:32 PM

Quote:

Originally Posted by joe231

What is a sport salvage tach?
Posted via Mobile Device

I have one of these and have some install pics in the second link, post #54 on....

http://www.gmsportssalvage.com/?q=node/1316

http://67-72chevytrucks.com/vboard/s...d.php?t=470240

1985-GMC · 04-12-2012, 11:50 PM

Quote:

Originally Posted by 1985-GMC

It should be the same, just 4K instead of 5K.

Quote:

Originally Posted by joe231

Same as what?
Diesels don't have ignition coils...

Anyone know if the factory tachs will run of the alternator?
Posted via Mobile Device

I was just saying that the factory Diesel tachs should be the same as gas tachs, as in they are eletrically operated and not mechanical and also 4K not 5K.

And yes I do realize that...

Look here: http://67-72chevytrucks.com/vboard/s...d.php?t=140436

motornut · 04-13-2012, 07:20 AM

Quote:

Originally Posted by J Knight

I have one of these and have some install pics in the second link, post #54 on....

http://www.gmsportssalvage.com/?q=node/1316

http://67-72chevytrucks.com/vboard/s...d.php?t=470240

that looks nice but does it come in the right font?
no pics, they do say it does tho...

J Knight · 04-13-2012, 07:57 AM

The font pictured in the links matches almost perfect with the 85mph speedo but I haven't seen if they have the older font of the 100mph speedo's.
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**Corts60** · 04-29-2012, 06:48 PM

Quote:

Originally Posted by joe231

Anyone know if the factory tachs will run of the alternator?

Posted via Mobile Device

You will need the Dakota Digital interface to turn the alternator signal into something usable for the gas tach.

v30crewcab · 04-29-2012, 09:48 PM

Man I need to find a complete gauge assembly out of a big truck, with the diesel tach, and the air pressure gauge on the left. that would be sweet in my cummins truck! need to figure out where they're all sitting. never see them anywhere.

1985-GMC · 11-15-2012, 03:53 PM

Has anyone bought one from LMC yet?
http://www.lmctruck.com/newparts/csb/csbrpt.htm

Chevyman350 · 11-17-2012, 04:42 PM

I wonder if anybody has asked LMC to looked in to reproducing the 1980 tach.??

1985-GMC · 11-17-2012, 07:22 PM

Whats wrong with the second tach.

Chevyman350 · 11-18-2012, 05:43 PM

I am putting a tach in a 1990 cluster and line the look of the canadian 1980 tach..

Look at the pics from 73-87.com

Just a prefrence

1985-GMC · 11-18-2012, 06:51 PM

The 80 canadian tach doesn't look any different then the original 80-87 US tachs, the only thing that looks different is the speedo. In fact it looks just like the 3rd LMC tach but without the redline.

**HIGHWAY BY THE SEA** · 11-18-2012, 10:13 PM

I sometimes wonder how accurate these old tachs are?

1985-GMC · 11-18-2012, 10:56 PM

Pretty accurate once you do the POT mod and sync it with a known good tach.

Chevyman350 · 11-19-2012, 02:24 PM

Quote:

Originally Posted by 1985-GMC

The 80 canadian tach doesn't look any different then the original 80-87 US tachs, the only thing that looks different is the speedo. In fact it looks just like the 3rd LMC tach but without the redline.

I like the redline mark, just my prefrence, I was under the impression that 1980 was the last year for tach's?

Did they have them untill 1987?

1985-GMC · 11-19-2012, 02:38 PM

They had them until 91 in the crew cabs and suburbans. Its just the 73-87 site didn't put pictures up after the 80 tach.

Chevyman350 · 11-19-2012, 04:06 PM

Quote:

Originally Posted by 1985-GMC

They had them until 91 in the crew cabs and suburbans. Its just the 73-87 site didn't put pictures up after the 80 tach.

I just learned something new!

MalibuSSwagon · 11-19-2012, 11:06 PM

tachs were available all years except the 90-91 electronic speedos

1985-GMC · 11-19-2012, 11:45 PM

Oh yeah I think you're right, that's why you see people piece them together for the 90-91 trucks. There's no reason why they shouldn't have come with them though, the tach still reads off the distributor the same.

MalibuSSwagon · 11-20-2012, 12:29 AM

Likely because it wasn't a popular option in the first place and it would have required GM to design a second case for the tach/electronic speedo.Cheaper to drop the option altogether.

motornut · 11-20-2012, 11:00 AM

Quote:

Originally Posted by HIGHWAY BY THE SEA

I sometimes wonder how accurate these old tachs are?

mine is good but i don't know if it's been modded,back shown
I ran a second tach for a while

saw this one earlier this year,yard wanted 100.
doubted it would work,rusted up

Jeepwm69 · 05-06-2013, 10:30 AM

So looking at the LMC tachs, if I wanted to put one in my 83 GMC, I'd buy the tach, the wiring harness, but where do I get a fuel gauge to go in the bottom of the tach? The only fuel guages LMC lists for tach equipped trucks are for 81 and down trucks.

J Knight · 05-06-2013, 03:07 PM

Quote:

Originally Posted by Jeepwm69

So looking at the LMC tachs, if I wanted to put one in my 83 GMC, I'd buy the tach, the wiring harness, but where do I get a fuel gauge to go in the bottom of the tach? The only fuel guages LMC lists for tach equipped trucks are for 81 and down trucks.

Those tachs that lmc sells are replacements for a tach cluster. You will need an original tach cluster for it to fit.
Posted via Mobile Device

1BadAction · 05-08-2013, 06:14 PM

Quote:

Originally Posted by 1985-GMC

Diesel tachs are 4K http://www.ebay.com/itm/1986-1988-19...item53ebb69f4c
GM part number 25054948

Old thread, but does anyone have the part number to this gauge with 5k RPM markings?

04-12-2012, 08:56 PM	#52
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: 7K 73-87 tachs Subscribed!

04-13-2012, 07:57 AM	#56
J Knight Registered User Join Date: Jun 2011 Location: Baytown TX Posts: 2,219	Re: 7K 73-87 tachs The font pictured in the links matches almost perfect with the 85mph speedo but I haven't seen if they have the older font of the 100mph speedo's. Posted via Mobile Device __________________ John 82 Chevy Silverado 350ci/TH350 Last edited by J Knight; 04-13-2012 at 08:02 AM.

04-29-2012, 09:48 PM	#58
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 983	Re: 7K 73-87 tachs Man I need to find a complete gauge assembly out of a big truck, with the diesel tach, and the air pressure gauge on the left. that would be sweet in my cummins truck! need to figure out where they're all sitting. never see them anywhere. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

11-15-2012, 03:53 PM	#59
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: 7K 73-87 tachs Has anyone bought one from LMC yet? http://www.lmctruck.com/newparts/csb/csbrpt.htm __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-17-2012, 04:42 PM	#60
Chevyman350 Registered User Join Date: Dec 2009 Location: Madison, Wi Posts: 80	Re: 7K 73-87 tachs I wonder if anybody has asked LMC to looked in to reproducing the 1980 tach.??

11-17-2012, 07:22 PM	#61
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: 7K 73-87 tachs Whats wrong with the second tach. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-18-2012, 05:43 PM	#62
Chevyman350 Registered User Join Date: Dec 2009 Location: Madison, Wi Posts: 80	Re: 7K 73-87 tachs I am putting a tach in a 1990 cluster and line the look of the canadian 1980 tach.. Look at the pics from 73-87.com Just a prefrence

11-18-2012, 06:51 PM	#63
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: 7K 73-87 tachs The 80 canadian tach doesn't look any different then the original 80-87 US tachs, the only thing that looks different is the speedo. In fact it looks just like the 3rd LMC tach but without the redline. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-18-2012, 10:13 PM	#64
HIGHWAY BY THE SEA Senior Member Join Date: Nov 2012 Location: BY THE CAROLINA SEA Posts: 922	Re: 7K 73-87 tachs I sometimes wonder how accurate these old tachs are? __________________ FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion

11-18-2012, 10:56 PM	#65
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: 7K 73-87 tachs Pretty accurate once you do the POT mod and sync it with a known good tach. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-19-2012, 02:38 PM	#67
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: 7K 73-87 tachs They had them until 91 in the crew cabs and suburbans. Its just the 73-87 site didn't put pictures up after the 80 tach. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-19-2012, 11:06 PM	#69
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	Re: 7K 73-87 tachs tachs were available all years except the 90-91 electronic speedos __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi

11-19-2012, 11:45 PM	#70
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: 7K 73-87 tachs Oh yeah I think you're right, that's why you see people piece them together for the 90-91 trucks. There's no reason why they shouldn't have come with them though, the tach still reads off the distributor the same. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-20-2012, 12:29 AM	#71
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	Re: 7K 73-87 tachs Likely because it wasn't a popular option in the first place and it would have required GM to design a second case for the tach/electronic speedo.Cheaper to drop the option altogether. __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi

05-06-2013, 10:30 AM	#73
Jeepwm69 Registered User Join Date: Jan 2009 Location: Arkansas Posts: 689	Re: 7K 73-87 tachs So looking at the LMC tachs, if I wanted to put one in my 83 GMC, I'd buy the tach, the wiring harness, but where do I get a fuel gauge to go in the bottom of the tach? The only fuel guages LMC lists for tach equipped trucks are for 81 and down trucks.



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