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vandeano

08-15-2006 05:59 AM

Tach fluctuates over 4500 rpm

My Tach starts to fluctuate when it hits 4500 rpm. Below that it is steady, but once it hits 4500 rpm it fluctuates to 5000 rpm. This is a new Tach, my old one didn't do this. This is a AutoMeter Marine Tach. I double checked all the wiring. Even ran a separate ground with no avail.

vandeano

08-16-2006 06:46 PM

Re: Tach fluctuates over 4500 rpm

I take it Im on my own on this :D

Ted G

08-16-2006 07:16 PM

Re: Tach fluctuates over 4500 rpm

I just had one doing it over 4000 and it turned out to be the distributor, play in the shaft was causing the pole piece to give varying signal at high rpm. New dist and it's rock solid to 5000. 96 502 EFI with Gaffrig tach.

vandeano

08-17-2006 02:01 PM

Re: Tach fluctuates over 4500 rpm

Thanks, I'll check it out. :drink:

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