Tachometer with hour meter, 0-4000 RPM, mechanical drive. Input drive ratio is half engine speed. P/N MS35916-2. NSN 6680008252076. Includes mounting hardware.
Fits various M series trucks such as M35A2, M54A2, M809, M939 etc. Not for use with the M35A3.
Manufacture may vary from photo depending on current stock. Differences are minor and all units perform the same.