Very close, 0 Full - 90 empty, slight variations by a few Ohms here and there.
One thing to remember is that it is all relative.
I would rather have a gauge that read empty before the tank was than one that showed it still had a 1/4 of a tank, and I am stuck on the side of the road.
Reason why I say it is relative is that there are at least four places for variations to effect the readings.
Sending unit - its just a big variable resistor.
Wiring, as it ages the Ohms increase - hopefully it never goes to infinity.
The gauge electromechanicals,