The most reasonably priced component used on the Xj550 Seca 1981 (b) Usa Meter Xj550h is the Washer(6a1).
The twenty-two Xj550 Seca 1981 (b) Usa Meter Xj550h component parts are all listed in this schematic.
The Meter Xj550h is made up of components including this Tachometer Assy which is the most expensive.