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Bouncing tach needle 200 1986

posted by  Xraybob on  Fri Oct 21 07:05 CST 2011
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last visit: Fri Oct 24 05:32 CST 2014
[RELATED]

I have a large tach in my insturment cluster and until last week all was fine with it. This week it would suddenly drop to zero or just bounce around from its normal needle position to low to normal to zero. I'd never know when it would do it. I reached up under the dash and made sure the spaded wire was seated properly, but that didn't change the issue. Is there any wiring in the engine bay that might cause this problem or is it just my tach that's crapping out?
--
'86 sedan with 465,000 miles on the original engine and automatic transmission






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