HELP! Tachometer's gone psycho!

I suspect that you are getting some interference from plug wires, that is, induction in tachometer signal wire from high voltage in plug wires.

Perhaps a shielded signal wire will cure the problem.

Re-routing the signal wire so it does not run parallel in close proximity to any of high voltage conductors may also solve the problem.

wjajr, thanks for your reply. Do you have any recommendations for what I can use to shield the signal wire? :salute: