Joker,
If you are asking me whether or not to try it, I would say no. Let some of the wiser heads weigh in first. If one sender has the high ohm reading when it is low and the other when it is high, I am not sure how your gauge would read that. Maybe backwards. (Or maybe let all the smoke out.) If one sender was 240 ohms full and zero (or a low reading) empty and the other was 30 ohms full and zero empty, then a resistor in the neighborhood of 33 - 39 ohms (and at least a 5W rating) across the two leads would bring the 240 ohms down to 30ish. But yours is reversed. The principal does not apply.
Pity too, that would have been too easy a fix. The resistor would probably cost about a quarter.
