The most reasonably priced component used on the Rmx250 1989 (k) Usa (e03) Trip Meter (model T) is the Washer (4.3x13x0.80).
The most expensive part in this assembly is the Trip Meter.
This schematic depicts all components used in the Rmx250 1989 (k) Usa (e03) Trip Meter (model T) partslist.