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The Detector-Tank will trigger only when a cart with a tank passes by.
It has a GUI for selecting the type of liquid to trigger on and the tank's current liquid level.
Upon opening the GUI you will see a spot for the liquid that will trigger the redstone current. To the left of that you will see a spot for the amount of liquid the cart must have in order to trigger the redstone current. An up-turned empty bracket means it is empty, a bracket with a square means partially full, and a bracket with a rectangle means it is full.