Scott wrote:

If you want to do it really simple, just embed a thin plexiglass tube
inside the wall of the tank, with a floating magnet inside, and epoxy a
$0.50 magnetic reed switch on the outside.  When the magnet floats down
to a target position, the switch is closed.  Another $1.00 for a
blinking LED gets you the warning light.

Plexiglass in a gas tank? Not a good idea! How about brass or aluminum.

Fred O.



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