The component with the lowest price in the TACHOMETER GEAR schematic is the Washer(6ta).
Of all the components used in this assembly the Gear, Driven is the most expensive.
Parts such as the Tachometer Gear: Gear, Driven, Gasket (nas), Washer(6ta), O-ring are included in the Dt125e 1995 4dk5 Switzerland 254dk-361e1 Tachometer Gear parts fiche.
