Symptoms of a bad tach? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jakes-66-K10 · 06-13-2005, 12:24 PM

How do you know if you have a bad tach? I scored one from a junkyard the other day (along with lots of other cool finds) and this weekend hooked up everything.

This tach kinda works. It "peaks" but won't drop back down. For instance, At first it peaked at idle, I'd rev up the engine and the needle would climb but wouldn't come down. So it sticks wherever the highest RPM setting was.

I wouldn't be suprised if I hooked things up wrong though. The distributor hookup and the tach hookup I'm pretty sure I got right but I may have hooked power up to the wrong spot in the fuse box. I'll have to check when I get home... would this cause a symptom like this?

06-13-2005, 12:24 PM	#1
Jakes-66-K10 Registered User Join Date: Aug 2004 Location: Idaho Posts: 640	Symptoms of a bad tach? How do you know if you have a bad tach? I scored one from a junkyard the other day (along with lots of other cool finds) and this weekend hooked up everything. This tach kinda works. It "peaks" but won't drop back down. For instance, At first it peaked at idle, I'd rev up the engine and the needle would climb but wouldn't come down. So it sticks wherever the highest RPM setting was. I wouldn't be suprised if I hooked things up wrong though. The distributor hookup and the tach hookup I'm pretty sure I got right but I may have hooked power up to the wrong spot in the fuse box. I'll have to check when I get home... would this cause a symptom like this?



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