The water level in the grey tank has never worked right in ours, and many others' TM's, I don't rely on it anymore (even with the new unit). Apparently the sensors get clogged up with residue in the grey tank. As far as the fresh water tank goes, just lift up the seat over where the tank is and look at it.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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