Hour meter keeps track of important maintenance times for oil changes, valve adjustments, spark plugs and more Usable with any gas engine Records and displays up to 9,999.9 hours Hours automatically roll over Peel & stick or attached with supplied hardware Connects to spark plug wire, so no batteries are needed Safely and completely encased in 100% epoxy Hour/tach meter adds the ability to check engine rpm; works with any has engine up to two cylinders at speeds up to 8000 rpm Firing pattern: 1 spark = 1 rpm; resolution in 10 rpm increments. Made in the USA
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