When I start up my 91' the needle on my tach jumps up all the way up, and then drops all the way down. From there it does not move at all. Could this be a bad tach filter?

Thanks for any help.

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91' tach works when started and thats it

Posted: 11/28/10 8:57pmMessage 2 of 2

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eddie20875

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Lanoka Harbor, NJ - USA

Joined: 12/21/2006

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Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c

try disconnecting the filter and bypassing it, if it is the filter the tach should work. if it still doesn't work with the filter bypassed the i would think it would be the circuit board on the back of the tach.

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91' tach works when started and thats it

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91' tach works when started and thats it

91' tach works when started and thats it

in Forum: C4 Electrical, Body and Interior