Tach Fluctuating Related to Spark Plug Wires?

[PROFLYER]

2902 is the part # we need guys

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[prodiver]

I switched back to the original wires and now everything works the way it should.

 

[bearman]

not sure if its the RFI (Radio Frequency Interference) or the EMI (ElectroMagnetic Interference) that is causing the problems but it would seem that changing your spark plug to a resistor plug (current spark plug number with a "R" on the end) would be one cheap thing to try for a fix.