My 2004 American Tradition came from the factory with the SeeLevel system. It works great. After about 8-9 years it began to get inaccurate at times and I learned that scum build-up on the tank walls can affect the readings. I filled the waste tanks with water and added a bottle of Roebic K37 septic treatment and let it sit for a couple days before flushing out. The SeeLevel performed perfectly once again. Had to repeat the tank clean process every couple of years after that, though.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC