According to the blurb on the sheet that came with my adapter plate, "Unclip the top edge of the knee bolster panel under the steering column (it is NOT necessary to remove the panel). Remove one Phillips screw under the right vent. Unclip the dash bezel and remove (the bezel is just from the vent on the left of the radio to the vent on the right). Remove 4 phillips screws securing the factory head unit."

Hope that helps, I haven't gotten my factory service manual yet. BTW, if you need info on these trucks or where to get accessories (they do exist), and aren't a member of the TDR, check out www.turbodieselregister.com.. Extremely valuable info there in the 3rd Gen forum.