Outside Temp Gauge question...
Fact is, the ribbon that carries the current to the LED display is pinched / worn. The good news it is it is fixable in many cases. The stealership will fix it for a thousand bucks or so I believe. But if you run a search for "Instrument Cluster" in this or the W210 Forum you can find both really good DIY with photos and services that you can pull your cluster and Fed Ex it to them for the fix for a few hundred bucks.
Best of luck. If you come across some easier / cheaper method, ITS GOLD! So please post your experience here for future inquests.
Cheers,
MM430
If it makes you feel any better, BMWs of the same era also frequently have pixel issues.



