I have an 88 coach as well and if you are talking about the switch that is used when the vehicle is parked, mine is located in the air compressor compartment on the dirvers side of the coach in the front.
If you look at the compressor the switch is located on the wall panel in front of it near the top of the compartment. It is a limit control switch that you can adjust to provide air when the preasure drops. (I have mine set to come on when it drops to 60 pounds and go off at 90 pounds.)
The compressor that is in mine il limited to 100 pounds so can only go so far with the high end.
Check your switch to see if it is ok and if not I think you can get them a Grainger. I think I got from Newell parts department.
Good luck, Wally
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