digital holley shift light rpm 0 periodic - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 1 Old 07-13-2018, 09:05 AM Thread Starter
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digital holley shift light rpm 0 periodic

I have a holley sniper shift light that just recently started jumping all over with rpm reading. I have put 2 other tachs on it with little rpm variance no drop to zero. I have installed a new distributor, TFI, coil. I also have monitored voltage at the coil on the + side and same voltage as battery when running no indication of dropping. I have rewired the shift light with all new wiring and still does it. Weird thing is when I switch over to my Summit ignition box, with either coil, the shift lite no longer does it all. MAYBE a bad poorly adjusted ignition switch? I'm at a loss. please help.


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