Thats to ensure accuracy of your ignition and injector readings, it may be an inconvenience, but atleast they addressed it. Ive seen a few rx7's with haltech have upper rpm break up because of ignition issues because of the haltech. And apparently that's just the way it is. Sorry guys. The megasquirt is an good ecu, definetly a competitor in my opinion. Just not for the faint of heart. The ms3x is serious. Ill bet wiring specialities could put something together to make it plug and play.