I used Princeton Probes, capacitance senders for the wing tanks I built for the Black Bird, and they worked.
On my Panther, I am using the same float senders at the low point in the tank, just like is used in all the RVs. I don't care so much that they are accurate at full to half full, but when that float starts to move down, I will know something, to be recorded at a later time. I will know when my fuel flow/totalizer tells me how much I have used at that point. My Panther Building Documentation at <http://pantherbuilder.org/> PantherBuilder Web Site Daniel R. Heath - Lexington, SC