Tachometer fits for Farmall IH 460 560 660 Gas Diesel 383093R91 Hour Meter
The IHC / Farmall part number it replaces is 383093R91, 383092R91 375679R91. The tach has a 5/8" UNF cable end and has a nice 12 volt light option feature. The light option feature you can choose to use or not to use it.