Hardline Products HR-8061-2 Hour Meter/Tachometer for up to 2-Cylinder Engines Works with any gas engine up to two cylinders and 16,000 RPM Adjustable input for all types of ignitions, including fuel injected engines Hour meter shows total hours accumulated; hour/tach meter shows RPM's when the engine is running Easy installation; no power or ground required Internal battery lasts up to 10 years Instillation wire is 14 inches long