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Old 05-17-2017, 12:16 PM
Ron La Savio Ron La Savio is offline
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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.
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Old 05-18-2017, 06:35 AM
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chevymaher chevymaher is offline
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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, 07:03 AM
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pitts64 pitts64 is offline
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Run a jumper cable between the battery negative lead and the block and take it for a ride..
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