If you look at this diagram..the rev limiter appears to the one of the inputs to the coil side of the relay. The rpm input gets data from the EZL, which also feeds the tach, etc.
I believe the RPM signal voltage range is 6-12 volts. So in theory if you were to modify the signal so that it doesnt peak at 12...you could rev higher as the limiter wont cut the fuel pumps....
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