Quote:
Originally Posted by painterljp
Thanks for input will check power wire, i have already checked it is plugged into the tach position on the distributor. So that end is fine. Will check power source wiring next and ground. Will post back, it won't be til I can go pickup truck on Monday. Just don't want to have to buy another tach til I make sure it's tach itself.
We have an aftermarket tach in the 68 gmc with an HEI. It is fine with no filter it works just like it's supposed to. Just can't seem to figure this one out. Dont want to go buy another tach to find out it's screwed up somewhere else.
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If you have a known properly working tach you could hook it up to the truck and see what you get. That would tell you if the tach output on the HEI is perhaps at fault.