Did you try adjusting the brightness?
I don't know which M-B you drive, but you can adjust the brightness of the instrument cluster by turning one of the knobs on either side of your speedometer (forgot which one...I *think* it is the trip odometer RESET knob). I didn't see you mentioning that you tried adjusting it in your post...so I thought you might not realize it...if so, it would solve your problems.
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1995 black pearl/black Mercedes-Benz E420  :
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