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Same features as hour meter, plus tachometer feature. Track service time and rpm of your machine-perfect for timely oil changes, valve adjustments, and spark plug replacements, etc. Usable with any gasoline engine (up to two cylinders and 8000 RPM)-Firing pattern: 1 spark= 1 RPM; resolution in 10 RPM increments. Peel and stick or attach with enclosed hardware. Connects to spark plug wire so not batteries are required. Safely and completely encased in 100% epoxy.
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