Hour Meter and Tachometer
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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.
Cotice: Hour Meter and Tachometer