My '92 coupe lost the temperature indicator on a recent trip to Birmingham. Aside from how to remove the round disc in the dash next to the instrument, I haven't found any useful info on removing and replacing this instrument. Nor have I found anyone offering this piece. To more fully explain, I have a visible background light on the instrument face at night, but no temperature read out. The instrument looks blank in daylight. I haven't dug into the factory manual yet. By the way, Clark's Garage gave me the correct advice for a failed cruise control. Once again it was the circuit board at the driver's left knee.
Thanks to the PET parts listing posted here, I can at least identify the part number for the temperature indicator I sought info on in the above post. It is the Outside Temperature Gauge, 9444 641 223 00, and it appears on Illustration Page 903-00 in PET. Thanks for posting that info. Now I search for the part.
So mine went out as your did. I found a guy in Miami Florida. I shipped him mine and he sent me a refurbished one. Can't remember how much it was, but mine now works. His user ID on EBay is: Promotion951. Do a search for that on EBay and message him.
Hope this helps.