The sensor gauges, especially the black and gray tanks, often will give you incorrect readings. The "remedy" mentioned in the above post will sometimes work to clean off the terminals and walls. If you have a back flush feature for your black tank, have you used this?
After you empty your tank, you might try pouring in a bucket or two of water down the toilet so that there is some liquid left in the tank to prevent it from drying out. When you are driving home from the campground, the liquid sloshing around in the tank will help keep it cleaner. When I think of it, I sometimes add some Calgon water softener to the bucket. This apparently leaves a slippery coating to the tank walls/bottom which helps reduce buildup of crud along these walls.
Having done all of these things, I still get false readings!
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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