#1421, "RE: Megasquirt Question" In response to In response to 9
edis was one of the first methods of running spark on our car. the 420a input is just the settings and a few hardware mods to input our crank signal and use that for a tach signal. So to answer your question you would be better off using the 420a input and spark control will be up to you. The latest method is to use the 4g63 ignitor and a crane ignition box for amplification.