I have never payed any attention to the tank sensors. After you live in a RV you will learn when to dump tanks. I also drank black tank first, then I close valve set timer for 8 minutes set time on iPhone, and repeat, Then after flushing I put in about 3 minutes, close valve. Then empty both gray tanks. Works for me. We do know boon docking at all. I had enough camping in my 26+ years of service in the US Army. We are RVer's not campers.
Happy trails.
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