I have an 86 with the Atari dash, but I have had my dash pad off and back on. If you re talking about replacing your existing dash pad with a totally different one, if you can remove your existing one you should be able to put a different one on. To take mine out and put it back in was not difficult, time consuming yes but not difficult.
In my case it was remove the bezels off the instrument cluster and center of the dash. Find all the screws that held the dash on, IIRC there were a number along the front of the dash and a couple in the defroster vents. Once they were all out, you pulled and gripped the dash pad and pulled it away from the windshield lifting it a little at the same time till the clips unhooked from the dash framework. Once that was done it was off and just move it out of the way. Installation was the reverse.