I find the tank level indicators accurate if you keep the tanks clean. I have the 24.5 gallon black water tank (the bathroom sink also drains in it also), so that is the one that fills up first. The third light on the black tank comes on at about 80% full (5 gallons from the top).
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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