If you still want to find the original manual for this motorhome you can find one for two week free rental from the internet archives.
Tip on cleaning the sender unit if that is the cause of you problems, get a spray can of electrical contact cleaner and spray inside the electrical compartment. Exercise the sender a few times and spray again. repeat as needed. then take a Ohme meter to the contact and ground to see if you have a variance in reading.
I don't know if you got the stalling at stop lights and signs sorted out, I would presume after heavy braking. But I would be checking for a "DASHPOT" or anti-stall solenoid. Obviously have the mechanic re torque the carb etc.
I own 1978 empress on a Dodge MB300 chassis so at times have the same problem.