Thank you, Evan. Took the coupe into Enrique of Mr. MBMotors fame and while the car was being serviced by his assistant, I asked him to show me how to pull the instrument pod out of the dash so I could take a look and hopefully fix the thing.

He grabbed his pull tools and warned me about pulling too much as it could damage the instruments. Enrique ended up pulling with almost all his might to pull the cluster out. After dissassembly, he came over to take a look at it, and sure enough, the wheel shaft had slipped out. A simple push re-inserted it into proper position. He was lamenting how much speedo shops charge for such a simple procedure.

The key to keeping it from popping out again is to somehow squeeze the shaft to flatten it so it wouldn't pull out by itself again. Now sure how this can be done, but a good strong vice grip with long enough handles to get some leverage on it might do the job.

Next time I have to fix it, I'll know how. Thank you for your help.