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Initial/ total are based on many factors. First find out what your initial/total is. Then subract them and you have your centrifugal advance. The higher performance an engine, the tighter it needs to be. SBM's like about 34* total.

Dial back technology has advanced since their introduction. I use them on Pertonix, MSD, & points sytems conistently.. My old Mac digital light I bought back in 02-03 did have some of the troubles mentioned here. Even a SnapOn had trouble. The one your getting should work just fine.

Well worth the money... Being able to set initial and total is super easy. It also gives RPM readout, and you can set dwell on points too. It also give you voltage to show your charging while running. I have almost the same light, different model, but Matco brand(Innova makes it for them)