Gordon,
I don't have problems with sensors on all the tanks but I do from time to time have a problem with the black tank levels. Out of three Rv's that I've owned not one of them was trouble free in that area. With that in mind you may not want to focus to much energy on that particular problem
I will say that I have had fewer problems with our Montana. I feel that the reason for that has more to do with the black tank flush than the sensors.
We also use water softner and detergent in that tank and many on this forum will advise you to do that.
Having said all that I will also add to please keep us informed. There are many here who would love to know a remedy for the problem.
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