Tachometer replacement for Allis Chalmers. Fits Allis Chalmers tractors: 170, 175,180,185, 190, 190XT, 200, 210, 220 Fits tractors: 180,185, Late 190 (SN 20600 UP), 190XT Gas / Diesel Also can be used on: 200, 210, 220 The part numbers it replaces: 70252409, 70255036 Tachometer has a Ratio of 1: 1.48, and is alternator driven. Must use with tach drive that has 12 & 45 teeth and alternator using 3" pulley for the RPMs to read correctly. Tach rotates clockwise . The housing diameter is 3 3/8" (85mm) Temperature Gauge: replaces Allis Chalmers part numbers: 70240989, 240989 These gauges in this listing have nice metal hd case with Yellow Zinc "Cad" Plating for corrosion resistance protection! The gauges have mounting studs and brackets, rubber gasket seal for mounting flush to dash with glass lens. Gauges have a nice 6 or 12V light feature included so owner has option to use or not to use. Replacement Allis Chalmers Water temperature and Fuel gauge is electrical sending type. Fuel gauge: replaces Allis Chalmers numbers: 70240988, 240988 Fuel gauge 2" Diameter 52MM, dash mounted with studs and bracket, chrome bezel with glass lens. 10 - 180 ohms Full Gauges do not come with any sending units! Amp gauge: replaces Allis Chalmers numbers: 70254407 Please confirm fitment before buying.