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Product DescriptionSierra small engine tach/hourmeter. For any gasoline motor up to 2 cylinder. Displays RPM up to 9000. Allows hour monitoring for even the smallest outboard motors. Great for 2 or 4-stroke engines. Displays RPM when running total hours when off. No power or ground required. Water and shockproof. Automatically turns on and off with the engine. Sierra Part #56969P.