[hharney]

Legally the gauge only has to read "E" when empty. So that should not be too difficult to find that correct setting for each sensor. Then if you calibrate the gauge to read "F" when the sensor is all the way up (full) that again should not be all that difficult. Couldn't this be performed with no fuel on the bench? With both of these scenarios accomplished it should be close for what's in middle.

Maybe I am thinking to simple here.....................