Class A Motor Home that we recently purchased. The Toilet is on the opposite side of the sewer drain. We have a few issues. 1. The gauge always reads 2/3 full even right after we drain it. Can it...
I am not sure what you mean by "other side of the drain"
As far as the gauge goes.... I have had the same issue with the black tank gauge in every RV I have owned over the last 30years.
Calgon water softener helps. I put about 8 of in my tank and fill 3/4 full of water. Then drive around for a bit then dump. I have also let the Calgon sit in the tank overnight before dumping. Not sure that it made much difference.
Google "black tank Calgon" and you will find a good bit of information.