Some items from this specific schematic: Nut, Hexagon(663), Bulb (t-10 12v 3.4w), Tachometer Assy, Screw, Pan Head (31a).
Of all the components used in this assembly the Tachometer Assy is the most expensive.
The lowest price component in this Meter parts-list fiche is the Screw, With Washer(36y).
