1985 eldorado motor home class c 22 ' econoline 350

If there is anyone out there who might help me with any information
on this motor home . It would be much appreciated.
I am helpless in all workings .
I also have two gas tanks and do not know how to work the change
over on the left side of the steering column.
One reader has given me much info on manuals at
www.beavercreekboise.com which Intend to get into.
timkustom@aol.com was very helpful .
any info would be helpful.
Thanks
Lori Snyder