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The Tachometer Hour Meter. A 2-in-1 combination! Monitor operating hours and engine RPMs. It's a must have tool to help you keep track of scheduled services and oil changes. Plus, they're the perfect reminder for preventative maintenance. Jack's has Universal tachometer hour meters and those for Gravely, Honda, Marshall, Murray, Simplicity, and Snapper lawn mowers. With the help of a tachometer hour meter, you can get your mower on a regular maintenance routine so you’ll have a reliable machine every season.