Another unique feature of the Pro Mag 12 is a built-in Soft Touch Rev Control. The rpm limit is adjusted with plug-in modules and will save your expensive engine in the event of driveline failure or missed shifts. The limit is accurate to within 1% and operates by dropping the spark to individual cylinders then firing that plug on the next cycle to avoid filling the cylinder with fuel. This system provides a smooth, backfire free limit. Plus, you can plug in an MSD Two or Three Step Module Selector to provide multiple rpm limits that can be used during warm-up laps or for consistent holeshots. The cast aluminum housing of the Points Box provides a strong mounting foundation for the electronics and coil. All of the circuits receive a heavy duty coating of Humi-Seal for protection against vibration and moisture. MSD Electronic Points Boxe PN 8106 can be used with the Pro Mag 12 generators. The Coil is specifically designed to handle the voltage and current of the Pro Mag and can handle long endurance and marine events as well as drag racing events. Electronic Points Box PN 8106Recommended for races longer than 50 lapsRecommended for marine racingRequires 200-250 cranking rpmRequired with a 20 Amp Pro Mag GeneratorNote: Vibration Mounts are supplied along with matching DeutschPit Stop USA offers MSD Pro Mag Electronic Points Box - For Longer Duration Events (Over 50 Laps) 8106 at low everyday prices. Be sure to check out all of our products from MSD including MSD Magnetos Controls and Points Boxes and MSD Spark Boxes.