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Old 05-17-2017, 01:16 PM
Ron La Savio Ron La Savio is offline
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Join Date: May 2015
Location: Southern Colorado
Posts: 7
Default erratic Tach readings.

What would cause the tachometer to give erratic readings when additional power is turned on like turn signals, air condition, etc, while driving. This happens after the car is warmed up and running.
Got a BBC in a 70 Chevelle SS.
Ron L.
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Old 05-18-2017, 07:35 AM
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chevymaher chevymaher is offline
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Join Date: Mar 2014
Location: Kentucky
Posts: 1,191

Sounds like a bad ground is causing interference. I would take all grounds off sand them clean them up.
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Old 05-18-2017, 08:03 AM
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pitts64 pitts64 is offline
Join Date: Mar 2017
Location: Pittsburgh, Pa.
Posts: 32

Run a jumper cable between the battery negative lead and the block and take it for a ride..
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