GA tach cluster 1976 -77 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**southern parts** · 12-15-2012, 11:12 PM

pulled from a 76-77 half ton truck. 60 lb mechanical oil gauge. i`ve not tested it , but gauges appear to be in working condition. includes the harness, needs a new end on the ground wire. the housing has a few cracks and is missing the tab on the left. $150 shipped

**southern parts** · 12-21-2012, 07:22 AM

ttt

**southern parts** · 12-30-2012, 09:17 PM

was able to check the tach , it works but reads high. new price . $120 shipped

Duncan and son · 12-31-2012, 10:35 AM

Hey Woody we just bought a 1975 crew cab dually 454 camper special but know very little about 73-80 trucks. What is the difference between 73-75 gauge cluster and the 76-77 you have listed?
Always appreciate you , Thanks Paul and Jason

glimmertwin01 · 12-31-2012, 06:05 PM

73-75 have an Amp meter and the configuration of the plug going into the back may be different...but im nto totally sure when i put a 77 tach cluster in a 73 i had already swapped the harness for a 77. and my tach reads high too. the one in my 74 is the correct one for a 73- 75 and it is spot on...
hope that helps

80SPORT · 12-31-2012, 08:57 PM

You can adapt the ammeter harness to the voltmeter cluster but it is a bit of work ...use the newer plug and splice 12 v + to the voltmeter

Often reading high can mean the tach was in a 6 cyl originally ...will work fine but 25 percent high

71Burb · 01-01-2013, 04:02 AM

If that is a 6 cyl tach , iam interested. Any way you can confirm? Thanks, al
Posted via Mobile Device

**southern parts** · 01-01-2013, 10:05 AM

The truck i pulled it from is a 76-77 3/4, V-8 4spd. GMC. but that doesn`t mean someone didn`t change it out at sometime.
most of these that i`ve seen will have 8cyl stamped on the back , this one doesn`t, it has a four digit number (8775)
i`ll try to get a better pic of the tach later today.

ray_mcavoy · 01-02-2013, 08:45 PM

Quote:

Originally Posted by southern parts

was able to check the tach , it works but reads high. new price . $120 shipped

I'm interested at $120 shipped if 71Burb passes on it.

I believe there is a calibration resistor in a lot of 70's GM tachs that has a tendency to change value with age and cause them to read high.
Here's a page showing how to fix 1978-up truck tachs --> http://howtoalmanac.com/kevin/projec...chfixtruck.htm I think the internal circuit on the 76-77 tachs is slightly different but still the same concept.

**southern parts** · 01-02-2013, 09:33 PM

here`s a pic of the backside of the tach

4oldcars · 01-03-2013, 04:45 PM

I'll go $100

12-15-2012, 11:12 PM	#1
southern parts Senior Member Join Date: Apr 2003 Location: Elberton Ga. Posts: 3,472	tach cluster 1976 -77 pulled from a 76-77 half ton truck. 60 lb mechanical oil gauge. i`ve not tested it , but gauges appear to be in working condition. includes the harness, needs a new end on the ground wire. the housing has a few cracks and is missing the tab on the left. $150 shipped Attached Images

12-21-2012, 07:22 AM	#2
southern parts Senior Member Join Date: Apr 2003 Location: Elberton Ga. Posts: 3,472	Re: tach cluster 1976 -77 ttt

12-30-2012, 09:17 PM	#3
southern parts Senior Member Join Date: Apr 2003 Location: Elberton Ga. Posts: 3,472	Re: tach cluster 1976 -77 was able to check the tach , it works but reads high. new price . $120 shipped

12-31-2012, 10:35 AM	#4
Duncan and son Registered User Join Date: Sep 2009 Location: Lubbock Texas Posts: 1,049	Re: tach cluster 1976 -77 Hey Woody we just bought a 1975 crew cab dually 454 camper special but know very little about 73-80 trucks. What is the difference between 73-75 gauge cluster and the 76-77 you have listed? Always appreciate you , Thanks Paul and Jason __________________ You can shear a sheep every year, but you can only skin it once The person dealing with facts is never at the mercy of the person dealing with theory 1972 Cheyenne Super 402 400 A/c bucket seat tilt custom camper Longhorn 1975 Silverado 454 Crew cab camper special dually

12-31-2012, 06:05 PM	#5
glimmertwin01 Registered User Join Date: Mar 2008 Location: Rochester NY Posts: 1,022	Re: tach cluster 1976 -77 73-75 have an Amp meter and the configuration of the plug going into the back may be different...but im nto totally sure when i put a 77 tach cluster in a 73 i had already swapped the harness for a 77. and my tach reads high too. the one in my 74 is the correct one for a 73- 75 and it is spot on... hope that helps __________________ 67/68 K/20 "The BEAST" 68 K15 V6 LWB. 73 K20 GMC Burb "The Bomber" 74 K/5 74 K20 Custom Deluxe 86 K10 Shorty 92 K2500 Burb 95 K2500 GMC Life is what you make it Live each day like it was your last Old GM Trucks never go out of style

12-31-2012, 08:57 PM	#6
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	Re: tach cluster 1976 -77 You can adapt the ammeter harness to the voltmeter cluster but it is a bit of work ...use the newer plug and splice 12 v + to the voltmeter Often reading high can mean the tach was in a 6 cyl originally ...will work fine but 25 percent high

01-01-2013, 04:02 AM	#7
71Burb Registered User Join Date: Dec 1999 Location: Calgary,Alberta,Canada Posts: 70	Re: tach cluster 1976 -77 If that is a 6 cyl tach , iam interested. Any way you can confirm? Thanks, al Posted via Mobile Device __________________ Al from Calary. 72 Chev S/B Ground Up Project.

01-01-2013, 10:05 AM	#8
southern parts Senior Member Join Date: Apr 2003 Location: Elberton Ga. Posts: 3,472	Re: tach cluster 1976 -77 The truck i pulled it from is a 76-77 3/4, V-8 4spd. GMC. but that doesn`t mean someone didn`t change it out at sometime. most of these that i`ve seen will have 8cyl stamped on the back , this one doesn`t, it has a four digit number (8775) i`ll try to get a better pic of the tach later today.

01-02-2013, 09:33 PM	#10
southern parts Senior Member Join Date: Apr 2003 Location: Elberton Ga. Posts: 3,472	Re: tach cluster 1976 -77 here`s a pic of the backside of the tach Attached Images

01-03-2013, 04:45 PM	#11
4oldcars Registered User Join Date: Jun 2004 Location: On The Beach, S C Posts: 613	Re: tach cluster 1976 -77 I'll go $100 __________________ 4oldcars Driving: 1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado The ones I let go: 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 long bed, 03 short bed



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