This is not an altered unit for a Mustang, it is custom made for the Fairmont. The sender is 10 Ohms at full and 81 Ohms when empty.
1982-83 Ford Fairmont Fuel Sender Sending Unit
Vacuum Brake Booster For Ford Fairmont 5.0L/4.2L V8 3.3L L6 2.3L L4 1981 82 83
4 Seasons Engine Cooling Fan Clutch For 1978-1982 Ford Fairmont
HKAUTOPART Radiator Compatible with 1975-1993 Ford Fairmont Granada LTD Mustang Thunderbird & 75-88 Mercury Capri Cougar Marquis Monarch & 77-92 Lincoln Continental Mark VII, 3 Row Aluminium Radiator
Kaiakui 3 Row Radiator Shroud Fan fits for 1975-1993 Ford Fairmont Granada LTD Mustang Thunderbird, 1977-1992 Lincoln Continental Mark VII Versailles, 1975-1988 Mercury Capri Cougar Marquis Monarch
Right Rear Shock Absorber And Strut 1972-2002 Ford Fairmont Mustang XW7Z18125A