In my previous SMB, I just "gauged" the opaque grey water tank off of the freshwater tank, which of course I could just look at. But... I did have a few "oops" moments, and/or times I curtailed because I thought it was pretty full, but then it actually wasn't.
So, going by the corresponding freshwater tank volume, never worked all that well for me. I think it was a combination of the fact that I didn't pee into the grey tank (and that's where some of my freshwater tank exited), plus I would sometimes pour water down the drain that didn't come from the fresh tank. With the tank being fairly small, little things made a difference. Of course it wasn't life or death, but a grey tank gauge would have been nice.
Now on next van have bought a See Level gauge although haven't installed it yet. One note is that in my pre-buying research, there was some indication that the See Level with the optional water tank switch might have some issues with heat/fire. Maybe just a fluke, but after calling them and asking about it (which I forget the details of), I decided just to buy the gauge without the built in water pump switch. Didn't necessarily want the water pump switch in the same location anyway.
If you happen to have a fairly short tank (height-wise), they have shorter sensor strips that will be more accurate for shorter tanks. If you know this when you are ordering they can sub in a shorter strip from the get-go (otherwise they are a bit pricey to buy individually, and the kit comes with the average height strips).
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