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More experimenting...
Since regular household foil wouldn't really stand up on the side of the tank I went out to the home improvement store and picked up a 12" x 1" strap, and a 12" x 12" piece of steel.
The strap worked quite well but I really didn't have the resolution that I wanted (makes sense since its surface area is smaller it has less capacitance). The 12" X 12" piece of steel worked identically to the foil (which was also 12" x 12"). Another thing to figure out: The best way to stick the plate to the side of the black tank? Epoxy?
I did discover, though, that I could not power up the circuit with the plate connected to the output pin when the tank was full. For some reason it wouldn't read properly in that state. Disconnecting the plate and reconnecting (unclipping the alligator clip) would restore the proper values.
To have the circuit handle this I may use a small 5V reed relay.
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