Hi fellas,
I have the same setup like you and Bob for wing tanks. A Facet pump feeds he header; I simply open the valve from one wing or the other. I also bought a Dual LM394 Module, a small circuit board for about $8 online, and connected both channels to a wire from the main sender. One turns off the Facet pump when full, the other turns on a warning light when about only 6 gallons remain, before the engine goes quiet.
For wings, I simply wanted to know when each one is empty so not to needlessly run the pump when dry. I plan on alternating each wing and timing each draw, as others mentioned. The sensor is simply a small Neodymium magnet in a float, captured in a vertical track on the most inboard rib (bottom end) of the tank. Outside the rib is a magnetic reed switch, which likewise can turn on the light. No holes to drill or feed-through wiring to worry about. Magnets conveniently work right through aluminum. If anyone would like to try the same thing I have a few extra reed switches. They’re really small and free for the asking.
Les
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