This adjustable sending unit can be used in air-cooled Volkswagen vehicles that did not have an electric fuel level sending unit originally installed (mechanical fuel level float). For cars that had no fuel level sending unit at all, please use our part number 155-291-30200 "Steel Mount for Fuel Sending Unit for Early Model Volkswagens" along with this product for a complete installation. Allows for precise fuel level metering in virtually any size fuel tank. This product is especially useful when adding a fuel gauge to your split, oval, early bus, or early Ghia that had no fuel gauge originally.