The tachometer's compatibility with a wide voltage range of 9-32V ensures that it can be used in various settings, from small engines to larger marine vessels. Customized 2"(52mm) Auto Truck Boat Digital Tachometer 0-9990 RPM With Hourmeter fit for Boat Car Truck Motorcycle Red Backlight ...
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I have not seen anyone on the helicopter forums even try to use an optical tach sice i started in this hobby 10yrs ago.. Its all simply Hall-effect +magnet for combustion engines and phase sensor for electrical. Some problems i see with the optical tach. That one outputs S-bus digital...
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