Look at maker of fuel gauge for compatibility with fuel level sending unit.
If Smith gauge -
Nisonger Instruments :: the exclusive Smiths U.S. Warranty & Service Center since 1949
If Stewart Warner -
https://www.stewartwarner.com/produc...sors-switches/
If it's a float style, you'll need to measure the depth of your gas tank for correct part.
It is most likely a 33.5 -240 Ohm unit.
Hope this helps point you in the right direction.