The MC-3 Motorcycle Ignition is a universal ignition that fits most applications with 12-volts at the coils. It features a built in Rev-Limiter Two Step and Shift Interrupter. The MSD MC-3 Ignition can be used on 1, 2 or 4-cylinder engines using one or two coils. The following schematic illustrates the MSD MC-3 Ignition Wiring to Stock Dual Coil Ignition System.