Review on Feeler Gauge Timing Light with Inductive Gun - Engine Ignition Coil Tester for Car, Motorcycle, Marine, Lawnmower | Motor Vehicle and Gap Measurement by Jack Malloy

I was trying to time my hot rod but the timer jumped like crazy at higher RPMs. Research has pointed to various things like a timing chain, worn harmonic equalizer, etc., but I've also seen a few posts where people have mentioned that regular pilot lights won't work with aftermarket multi-spark ignition systems. Has tuned many cars over the past seven years. years, I even use it today. Still works fine, just draw a white dot on the tip of the feed wheel for a better view. You will also find the light is difficult to see unless in a dark place.