The Honda OIL PUMP - OIL PRESSURE SWITCH has sixteen products enlisted in the schematic.
Some items from this specific schematic: Circlip, 11m/m, Clip,eng.harness, Chain,oil Pump, Washer,sprine.
The most reasonably priced component used on the Cb400n Superdream 1978 England Oil Pump - Oil Pressure Switch is the Screw,cross 6x40.