Tach don't work right

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Sep 4, 2010 | 2:21 AM

rudedog333

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Joined: Sep 2010

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Tach don't work right

Hi All,
I just bought a 1992 C1500 SWB 2 wd pickup.
my Problem is the previous owner swapped out the 4.3 TBI V6 & installed
a 5.7 carburated V8 & the factory tach does not read right.
Is there any way to fix this short of replacing the tach with a V8 unit?
any help on this would be appreciated.
Thanks
Tom

Sep 5, 2010 | 12:33 AM

CoffeyLover

CF Junior Member

Joined: Aug 2010

Posts: 53

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From: Santa Clarita, CA

*****

Last edited by CoffeyLover; Sep 5, 2010 at 2:17 PM. Reason: Bad Post

Sep 5, 2010 | 3:01 AM

rudedog333

Thread Starter

CF Beginner

Joined: Sep 2010

Posts: 2

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No I don't know when it started, it was like that when I bought the truck.
I knew that the gearing & tire size (both are stock) affected the speedometer
but not the tach.
The tach is hooked right to the distributor.
Tom

Sep 5, 2010 | 10:53 AM

2wd-K5

CF Pro Member

Joined: Jul 2010

Posts: 845

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From: salmon arm BC

look for a green wire that is part of the distributor cluster, btw did the person instal an hei dizzy, or stick with the stock one? if hei, once u find the green wire plug it in beside the lead power wire, if the stock dizzy, then idk what