I was never able to calibrate mine correctly. After several hours of messing with them, I admitted defeat. The sensors are, IMHO in the wrong place and only connected with cheap phone cord. There is a mess of wires behind the right panel in the wet bay. I ended up installing the SeeLevel system and I'm very satisfied with it. While I chose not to have the display inside the coach, it's available. They also have a system that plugs into the Aladdin system but it's about 125 bucks more. Their sensors attach to the OUTSIDE of the tanks eliminating any false readings from TP and gunk in the tanks. If you want to see what it looks like, here is a
Clicky...Dennis