The reason I was asking is that I have the same problem. Well...kind of, mine has half a display readable and the other half black. I know is the LCD display since I had taken it apart and you can actually look at the LCD glass and see where the "corrosion" has eaten the display. Unfortunately, MB doesn't sell the LCD glass by itself, you have to buy the whole unit$$$$$$. I checked a few used car suppliers a while back but, they didn't have them. May be they are available now...
Happy hunting!

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J.H.
'86 300E