05-30-2018, 01:37 PM
On my 93 coach, the pipe complex ahead of the rear axle and up between the frame rails has a horizontal pipe that is connected via a couple 90's to the service tank, the pressure switch you are looking for will be the only thing in that area with a wire attached to it, all the other stuff is plumbing type items.
Jon Kabbe
1993 coach 337 with Civic towed