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Old 02-08-2011, 08:18 PM   #1
72 tigger
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Tach question

Bought a gauge cluster with a Camaro tach- the guy said it worked when he pulled it. The metal plate on the back of the tach has a 12V terminal & a COIL terminal stamped on it. I hooked a 12V lead to the 12V terminal & ran a lead from my HEI TACH terminal to the COIL terminal- it doesn't work. Does it need to be grounded? Any ideas? Thanks for your help! Kirk
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Old 02-08-2011, 08:29 PM   #2
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Re: Tach question

if it is bolted to the inst panel, and the panel installed in the dash, then it should be grounded. If all the lights work properly, then it is grounded.
Sounds like a bum tach if all the above is true
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Old 02-08-2011, 10:14 PM   #3
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Re: Tach question

The camaro tach I had before had a ground terminal also. I believe there is a thread on here with the terminals marked.
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Old 02-08-2011, 11:11 PM   #4
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Re: Tach question

If you tried to test the tach out of the cluster then 12 volt hookup, HEI and a good ground. I am with VA72 I think it has a ground terminal and if not you can use alligator clips to ground it to the backing plate will be fine. That is the way I test all of my loose tachs.


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Old 02-08-2011, 11:45 PM   #5
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Re: Tach question

Here's the pic showing the ground I was thinking of


and Gringoloco's thread on it...
http://67-72chevytrucks.com/vboard/s...d.php?t=251017
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Old 02-13-2011, 09:58 AM   #6
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Re: Tach question

I tried the tach again but ran a ground to the ground post & it works great! Thanks VA72C10 for the info!
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Old 02-13-2011, 10:14 AM   #7
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Re: Tach question

Quote:
Originally Posted by 72 tigger View Post
I tried the tach again but ran a ground to the ground post & it works great! Thanks VA72C10 for the info!
Cool! Glad that got it working!
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Old 02-13-2011, 11:34 AM   #8
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Re: Tach question

sweet... glad I was wrong!
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