Have any of you seen this?

The outside air thermometer digits are fading in and out. The best way to describe it is like a digital watch running low on batteries. The background light is working ok though. The digits fade in and out and sometime stays normal for a few hours at a time.

I am having the speedo cable replaced tomorrow and would like to get some ideas before so that I know where to begin. Any ideas??

Thanks!

94' e320 coupe

Mingson

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95 E320 Coupe Black - 70,000 miles with Parchment interior. Stock through out
93 400E Dark Blue - 65,000 miles Sold to my dad
86 300E Gold(yuck!!!) 126,000 miles- Sold, a really fun car with a lot of memories