Those numbers originally came from me so I know they are accurate.

It took me a week adding one gallon at a time to come up with those numbers. Actually, they are/were accurate for MY fuel gauge which then quit working a few weeks after I took the measurements.
The fuel, oil and temp gauges are IDENTICAL except for the painted dials. I.e., within the range of their accuracy the same resistance gives the same proportional reading. 10 Ohms is full scale on all, 73 Ohms is the zero end of the scale. The needle position vs resistance is very non-linear and unfortunately, some replacement senders are built with a linear response which screws up the gauge readings at anything other than the two ends of the scale. The mid-point on all the gauges should be with a sender resistance of around 26 Ohms. (All dependent upon my VOM calibration which is compliments of the Sears Bureau of Standards.)