Doug,
the dash panel is held in with flat head machine screws (sort of like the machine screw show below but with a flatter head, more like a washer, and no screwdriver slot in head). These machine screws are glued to the backside of dash. They are used to hold gauges, warning light array, turn signal array, etc., and panel to dash opening.
I had a bunch that had come unglued. Fortunately most were still in place, just not glued to dash panel. I don't know where you could buy these if needed, but not too hard to make. I made one from a large flat head machine screw and then ground the head thinner/flatter on my bench grinder. Each location where a bolt goes has a shallow machined recess, so it's easy to put them back in the correct spot. I used two-part epoxy to reglue them.
If you have the same three panel dash setup like my '05, you can get to the nuts for the center panel by removing the top dash access panel and from the under side. Once the center panel is out, the side panels can be done through the center opening. There is a plenty of excess wiring to allow you to pull the center panel out and lay it on a towel on the steering column to access the back side. However you may need to cut a few wire ties if you want to pull the dash panel without without unplugging anything.
I found a picture (attached) showing the dash panels removed and the amount of excess wire you have to work with. In your case you probably won't need to remove the panels completely. But if you do there are harness connectors you can separate at. I needed to strip the panels completely for the Hydro-Dipping so I had to unplug wires from every gauge and switch.