This is the tach to have in the dirt world, including sprints, and is coming on strong in asphalt. QuickTach features include: . 75 x 1. 75 Digital Display Aluminum Waterproof Case Mounting brackets Backlight that comes on when the engine is shut down and auto-off to conserve battery life. Highest RPM display automatically for 15 minutes when engine is shut down. Tach automatically clears and comes back on when engine is re-fired. Reset button for those times when you want to reset during a run. Self powered by a 9V battery Low battery indicator to monitor your 9V power supply. NOTE: For use on engines running a magneto, a #MSD8132 Pro Mag Tach Converter may be required (sold separately). The output signal that is used to trigger magnetos is different than a conventional electronic ignition. This compact device converts the Pro Mag's coil signal into a 12 volt square wave signal so common tachometers designed for electronic ignitions can be used with the Pro Mag. The Converter is less than three inches in length and its circuits are encased in epoxy for water and vibration resistance.Pit Stop USA offers QuickCar QuickTach Digital LCD Recall Tachometer - Black 611-100 at low everyday prices. Be sure to check out all of our products from QuickCar Racing Products including QuickCar Racing Products Digital Tachometers and Tachs.