I installed a mechanical water meter that measured flow from both water tanks just before a filter and the water pressure pump. Not as convenient as the "Watercounter" with its electronic sender but same principle. Just read when you fill, know your tank capacity and count up to know how much has been used. Certainly beat trying to read a sight tube on the lower tank under the forward berth!! I think it only cost about $75 and was calibrated for more accuracy than I even needed.
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