MSD Ignition Controller Digital 6A Ignition & Rev Control Universal # MSD64253MSD Ignition Controller Digital 6A Ignition & Rev Control Universal # MSD64253 Ignition Box Digital 6A Ignition with Rev Control Ignition Box Output: Capacitive discharge Circuitry: Digital Rev Limiter: Yes Timing Retard: None Data Acquisition: No CD Voltage Output to Coil: 520 540 V Current Draw: 0. 7 amps per 1,000 rpm Spark Output (millijoules): 135 145 Millijoules Minimum Operating Voltage: 12 V Maximum Operating Voltage: 15 V Length (in): 8. 000