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My grey and black water tanks gauges seem to work sometimes. My problem is with the galley tank. It always reads full. This is interesting because, when I park, I keep the grey and galley valves open until the night before I am going to dump the black water.
As others have said, I rely on my expeience and sound to let me know where I am. Oh, by-the-way, If you have a washer, be sure to open the grey water valve before washing or you may end up with a geyser in your lavatory (experience speaking).
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