*** IN STOCK SHIPS TODAY *** From light bulbs, to the high-speed retard function on an MSD timing computer, to air shifters, these MSD rpm activated switches turn on almost anything. They use MSD's plug-in RPM modules to turn on your components at any RPM you select.
#8950 Switch provides two options for activating a circuit, one to open a circuit or one to provide a ground path to close a circuit.