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-   -   erratic Tach readings. (http://chevelleforum.net/showthread.php?t=4750)

Ron La Savio 05-17-2017 12:16 PM

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.

chevymaher 05-18-2017 06:35 AM

Sounds like a bad ground is causing interference. I would take all grounds off sand them clean them up.

pitts64 05-18-2017 07:03 AM

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


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