I just installed a SeeLevel system in my 2021 Arctic Fox 27-5L. It was a very interesting experience.
The 27-5L has four tanks, all of which are pretty shallow. SeeLevel does not produce a 4-tank monitor with BlueTooth, but I was able to get a pretty tidy install of the SeeLevel display in the original control panel.
I have a Battery, Fresh, Grey, Galley, and Black display. I was able to retain the original pump and generator switches (even though I do not have a generator I have the switch), so did not need a display with those features.
The Battery display is not very useful, as I have lithium batteries and the voltage drop from the batteries to the display is significant. I could not get a display without that.
The instructions say metal and wiring needs to be kept away from the sensors. My fresh tank was surrounded on three sides by metal supports, and a rectangular shaft for the slide-out was close to the tank on the remaining side. I wrapped the shaft with a few layers of rubber sheeting similar to inner tube material, and that seemed to take care of it.
I did not use the original sensor wires, so the original sensors are still in operation. I used 35 feet each of blue and black 18-gauge wire, and 20 feet of 1/4" split loom for the install.
Installation was pretty challenging for me. Everything is covered by Coroplast, and there is a lot of tweaking and adjusting needed. The installation instructions say fill the tanks to 1/4 full and tape the sensors onto the tanks and adjust until the sensors work correctly. It takes very small vertical adjustments of the sensors to change the display reading, but I was able to get good correlation. Fresh, grey, and black tanks all read 25% when I secured the sensors, and the galley tank read 28%.
I was a bit disappointed in the resulting readings. It is way better than the 1/3. 2/3 original system, but I naively expected closer correlation. I used a calibrated water meter to fill each tank in 10% increments and noted the display reading for each increment. Every tank reads 100% when it is 80% to 90% full. I'll attach the plots as images.
One thing I learned about the installation (actually I learn the same lesson every time I work on an RV): It is a good thing I am retired, because I could never make a living doing this sort of thing!
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