MSD Ignition 8956 - MSD RPM Activated Switches

For 4, 6, or 8-cylinder engines with a stock inductive or MSD ignition that can handle up to 1.5 amps, these MSD RPM switches can perform a variety of functions, from turning on a bulb or solenoid to engaging an MSD Timing Computer at a certain RPM.

#121-8950
This RPM switch has two activation wires: one to ground a circuit, the other to open a circuit. Simply plug in an RPM module, and wire the switch to the circuit you want to control. When the engine reaches your set RPM, the circuit activates and stays on until the RPM falls below the set amount.

#121-8956
This window switch has two RPM adjustments: one to activate a circuit, the other to deactivate the same circuit, which is great for shutting down nitrous before the engine's rev limit is reached.

Note: Required RPM modules are sold separately