I went with the PS3 brake controller, don't know if your coach is on a freightliner if so starting in 04, they have an electric brake controller plug, by the steering colum. Just need the addepter plug to controller for about $15.00 Or you could hard wire it.
Do you have the manual? It should list how to hook it up as well
12 Tiffin Phaeton 40 QTH Cummins 380 ISC Freightliner ,air ride , air brake 10 k gen
04 Tiffin Phaeton 38GH Cat C7 330 Sold