SHELL miles kilometer trip counter tankfix NOS

Rare SHELL miles kilometer trip counter in new old stock (nos) condition. It is made of metal and with chrome finish. The diameter is 4,5 cm. The adjustment wheels work wonderfully. It comes with original packing and instructions. The instruction recommends to remove the blue film and press it lightly onto the dashboard. A made in Germany must have for classic cars without fuel gauge or with imprecise gas gauge. After the tank is filled with fuel, you just roll the wheels on the tankfix counter to match with the speedometer mileage.