I've seen those senders being used as a variable resistor in series with the gauge, in other words, a two wire device. If that's the case with yours, you'll need to closely match the resistance so the indication is nearly correct. If it's used as a potentiometer, which will need three wires, it's less critical, but still should be close. If you can post a bit of a schematic of the fuel sensor wiring, that should help to clarify what you might be able to replace it with.
I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-