Distributor for Chevy Distributor HEI 50,000 Volt PerTronix D71002 grommets 4L Engines For 1 seatbelts and accessories 4L Engines For 1 Input Source Options Three wire pulse signal generator input source Built in Vehicle Speed Sensor (VSS) input source Most Tremec transmissions Later model 700R4's Typically a sine wave signal Two wire pulse signal generator input source Classic Instruments SN96 or SN95 Typically a sine wave signal One wire ECM signals input source Typically a 5 volt square wave Output The output can be selectable between either 8000 pulse per mile or 16000 pulse per mile Outputs a 12V square wave 1975 1986 Chevrolet K5 Blazer 305 CID 1975 1986 Chevrolet C10 Suburban 350 CID