I have and 82 Mark VI and an 86 Mark VII. I've seen some questions that I can answer.

Someone was asking about adjusting the compass in the overhead console of a Mark VII. My compass used to be almost funny, I could be driving straight and it would change readings by 180 degrees or more. Also my temperature reading wouldn't always work. I would have to press the switches for the compass and temp a half dozen times in an attempt to get them to work.

I guarantee the solution will sound strange. After I replaced my radio antenna mast, everything worked just fine. I couldn't believe it myself, so I disconnected and antenna wire and went for a drive. I once again had the exact same problems.

So, if your overhead colnsole isn't working properly, replace the antenna mast.