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A simple alternative to a remote indicator would be to attach an electronic buzzer (which you could turn on and off) that would sound when the tank is full, empty, etc. so that when you are outside filling the tank, you should be able to hear the buzzer go off when the tank is full.
It would be a lot easier than wireless annunciation.
One word of warning though. I have been accused of adding circuitry to a project just because I might have a left-over gate or function. I am guilty as charged in that regard. But I figure if you are paying for a quad op-amp, you should use all of them for something.
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