I am fairly new to the forum and I posted this problem also at a different part of the forum. Thought I would do it here too, just in case I can get help, if that is OK.
As far as i can see there is no way I can get to the level indicator sensors on the Three tanks, Black, Grey, and Fresh. As with most of you I have to guess the levels for the tanks. Hoping to improve this but I have to get to the tanks to do so. Complete info on RV, is 2005 Jayco Greyhawk, model 30GS. The tanks are in the same basement compartment and behind the Utility Control Board. I would hate to try to remove that. Lots of pipe connections and electical, etc.
Hope some one can help but I really think Jayco goofed on making the things available.