The rev limiter module in the Ignitor III has a built-in LED light. The rpm limits can be set in increments of 100 rpm. Every long red LED flash represents 1,000 rpm while each short flash represents 100 rpm. As the flashes appeared we counted the number of long flashes and short flashes. At one point we were spot on at 6,000 rpm (six long flashes). We kept turning the rev limiter set screw until we showed five long flashes with two short ones. This told us our rev limiter was set at 5,200 rpm.