The Fop-1 Tripmeter is made up of components including this Tripmeter Assy. which is the most expensive.
Parts such as the Fop-1 Tripmeter: Gauge,air, Tripmeter Assy., Bulb, Speedometer, Pin,spanner B are included in the Xr500r 1981 (b) Fop-1 Tripmeter parts fiche.