I wouldn't worry about the monitors. Your Monty will tell you when she needs to be emptied: the toilet will burp; the shower will start filling up around your feet; and when you do the dishes, you'll say to yourself: self, go pull the handle!
In our experience of fulltiming, the black tank takes about 7-8 days with *our* normal useage; the shower is, with the Oxygenics Shower head only about 2 days (we like long showers); and the galley is also about a week.
I don't even look at them anymore. In my limited experience, they are as worthless as tits on a boar. Get it?
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