It should be under the dash near the steering wheel location. You may want to try logging onto www.rv.net and go to the Class A motorhome section and try posting this same question. A lot of great information located on that site for all RVing subjects.
Hi There I have A 1999 holiday rambler Vacationner . I just found mine it is under the steering cover on the right side it is mounted on the bracket that holds the steering wheel when it was a chasse .its hard to get to the screws to remove them .I moved mine on the face of the dash just under the dash, Hope this helps Bob