The MSD Programmable Shift Controller allows you to program different rpm points to trigger the shift solenoids. Any transmission configuration may be used up to a six speed trans along with any 4, 6 or 8-cylinder engine. It can be used with either 12 volt activated solenoids or pulse signal activated solenoids. The output wires to the solenoids are protected by a 20 amp fuse.Each solenoid activation is programmed in 100 rpm increments. Once the car is launched, the Control knows it is in first gear and when your desired rpm is reached, the second solenoid is activated. There is also a shift inhibit circuit to compensate for tire spin. LEDs on the side of the control illustrate each circuit (gear).The Programmable Shifter is a stand-alone control and can be used with most any ignition system that can provide a tach signal.