Fuel gauge question

[Our 68 Obsession]

Hi Guys:
I have a 74 Charger that I just bought and it has a fuel cell installed in the trunk. As far as I car figure out but the style and measurments its a 12 gallon RCI cell. Do you know of anyone that has sending units for these? Also any thoughts on a certain  type of fuel gauge thats works the best or will anyone do? I have been told that the sending unit and gauge have to be matched by ohm output, and am open to all advice so its reading properly. Thanks

[Plumcrazy]

I don't know what sending unit will fit but to use the factory gauge it will need to be between 10 and 73 ohms.

10 ohms when full.
73 ohms when empty.