Thomas,
The black tank readings take a clean tank. It just takes a little TP stuck to the side of the tank and it will not read right. Recommend you tape over that light and dump your tank once a week or so. You can hear it burp at the toilet as it gets full.
Your gray tanks and fresh water typically work fairly well.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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