The black tank(s) are usually the worst with this because of the paper and 'gunk' that ends up on the walls of the tank. Best thing for us is to use the black tank flush pretty much every time we dump, when we can. We also have a 'toilet wand' that we can put down the toilet and run water through, it does a good job of cleaning the tank (and the sensor in it) Our black tank is actually our most accurate as a result of this.
Your fresh water tank is a much bigger issue to resolve because it is already 'clean' presumably. Other than replacing the sensors with more expensive units, I don't really know what to suggest there.
At the end of our trips, we try to load as much fresh water as reasonable into both our black and grey tanks. We usually have a fair amount of extra fresh water on board, and instead of pouring it on the ground, we pump it into our tanks to dillute what is in there as much as possible before dumping. This has helped us I think, but these tank level 'gauges' pretty much suck unless you do something drastic and replace them completely.
I think a lot of us have just learned to deal with the inaccuracy of them and have learned how many days we can go on X amount of gallons as a primary tool
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2016 27BHS Elite
2012 F-150 EcoBoost / Max Tow (Sold)
2017 'Blue Jeans' 6.2 F-250 Lariat 4.3 gears.
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