Most of the cheap OEM level monitors are one wire to each level sensor. The "sensors" are simple open electrical terminals. The water touching the terminal grounds the wire allowing current to flow and light the simple LED light for that level. The tank has a ground near the bottom. The LED light is grounded through the push button on the panel.
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Paul Bristol
Dutchman Kodiak Cub KD176RD 2018
Nissan Pathfinder 2015
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