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If you like this concept and have the panel room for
the LEDs, as well as access for a vertical tube the
height of the tank, you could also make a magnetic
float that rose and fell in a tube (similar to a
sight level tube).  Then place the float in
proximity to a series of magnetic switches (e.g.
reeds or door alarm switches). This allows no
exposed elements to gas, and the LED nearest the
magnet would be switched ON.  Very simple, light and
inexpensive.  My plane uses similar magnetic sensors
for its gear position lights.

Scott Gettings

I like this idea, which has surfaced before, but where does one purchase a
floating magnet that could move up and down a small tube and be immune to
fuel degradation?

Del Johnson


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