wrote:

The float is usually hinged to the sender near the top of the
tank. The movement of the rheostat in the sender is linear but the
hinge's location creates a sine function to the indication, with the
top travel being rather slow and the lower travel moving much more
quickly.

That situation is easily fixed by using an L-shaped float wire.

George Patterson
Drink is the curse of the land. It makes you quarrel with your neighbor.
It makes you shoot at your landlord. And it makes you miss him.