1976 Scamp fuel gauge problems

That sender should do nicely. Something else to check. There is a short piece of rubber hose that connects between the fuel line running to the front of the car and the line coming out of the tank at the sender. There is supposed to be a flat metal strap that clips to the fuel lines on either side of the rubber hose. If this strap is missing/rusted out your fuel gauge won't work since it is grounded through the fuel line. If your strap is missing and you can't find a replacement, you can bridge the hose with a couple of hose clamps and a piece of wire...