Hour Meter and Tachometer

Hour Meter and Tachometer Aeration » Regenerative Blowers » Know when to service your engine. Small and large gasoline engines, outboards, generators and ultra light airplanes require service after a certain number of hours of operation. How do you know when it's time? These nifty little meters weigh only one ounce and are powered by the induced voltage around a spark plug wire–no battery needed. Only records actual running time (to 5,000 hours). Two-minute installation. Fully automatic.