Accel's new Ignition Module will work for both Single- and Dual fire applications. It has an adjustable rev-limiter and 15 preset advance curves to satisfy everybody, and everything from a stock engine to highly modified big inch motors. This easy to install ignition uses the stock rotor cup. The entire unit hides under the cam cover for a clean look. Fits Big Twins 1970 thru 1999, and Sportster models 1971-1997.