This may help
http://www.aulro.com/afvb/d3-d4-rrs/...ml#post1455210
Made the bracket to mount the compressor - fits between the 2 bolts for the windscreen washer bottle and unused captive nuts below the battery. I stripped out the diff lock components of the ARB loom and used it for the wiring. You can see where I mounted the switch.
Good luck,
Ian

