Sierra Tach-Hour Small Engine 56969PFor 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. Displays RPM when running total hours when off.No power or ground requiredWater and shock proofAutomatically turns on and off with the engineDisplays up to 9999 hours10 year internal battery lifetime
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