MSD 6462 6-BTM Ignition Control Box Multiple spark, capacitive discharge ignition control Ability to retard the ignition timing from 1 degree to 3 degrees per pound of boost with the click of a dial, maximum of 15 degrees, with dash mounted adjustable control knob Unit carries multiple sparks for 20 Degreeof crankshaft rotation and works on 12 to 18 Volt electrical system Accepts breaker points, amplifier and magnetic pickup trigger inputs Built-in soft touch rev control is adjustable with RPM modules