These units will also replace the OEM HD factory ignition module and sensor used on 1983 and later Harley-Davidson EVO motors. It is also an ideal upgrade for early electronic and breaker-point systems that require a mechanical advancer. The entire ignition fits inside the engine in place of the cam sensor or point plate and connects directly to the coils without the use of an external module. Early models MAY require drilling a small hole in bottom of nose cones for wiring. PROGRAMMABLE FEATURES -8 Point fully definable wide open throttle curve. 8 Point fully definable part throttle curve. Rev limit programmable in 50 rpm steps. Programmable dead cranking revs 0 - 10. Programmable rear cylinder offset, total of +/- 10°. Programmable rev limiter. DATA RECORDING FEATURES Total engine hours. Time at wide open throttle. Number of engine starts (two minutes running time counts as one start). Longest time operating at wide open throttle. Maximum rpm. Seconds near rev limit. Statistical analysis of time at rpm. Instructions included.