When you install a crank trigger system, having locked out timing may put a strain on the starter and flywheel. This compact controller provides a retard that automatically retards the timing during cranking to ease the pressure. The MSD Starter Saver measures only 1.5" X 3.5" X 2" and wires into your ignition system with only four wires. It can be programmed to retard the timing 10° or 20° during cranking only. The retard is activated when the engine begins cranking and is deactivated once the engine reaches over 800 rpm.