Tachometer for Massey Ferguson Tractor 20D 230 231 240 550 1674638M92 187718M92 I can not return so

I can not return so called defective electrical units to manufacture that are hooked up incorrectly

Has 5/8" - 18 UF capillary probe end and 1/2" NPT bushing

END with 1/2" brass NPT pipe bushing

and some models require the RPM on bottom

Tachometer for Massey Ferguson Tractor 20D 230 231 240 550 1674638M92 187718M92 I can not return soTachometer fits Massey Ferguson: 20D, 20E, 20F, 30E, 30H, 40E, MF 50, MF230, MF231, MF240, MF550, 230, 231, 240, 250, 255, 298, 550 UK Replaces Massey part numbers: 1674638M92, 187718M92, 1674638M91 Fits 3 3 8" 85mm diameter, 5 8" 18 UNF Thread, Anti Clockwise Rotation, This tachometer has chrome bezel with glass lens and are Yellow Zinc "Cad" Plated for corrosion resistance protection! They have mounting studs and brackets, rubber gasket seals for