The numbers on the clock of my 2000 Mercedes E320 have gone haywire along with the gear shift indicator. I can’t read either the time nor the indicator.
It sounds like this is a common issue, do a internet search and check out this forum:
http://mbca.cartama.net/archive/index.php/t-13220.html
It’s not clear if you need to replace the entire cluster or not, you probably need to talk to a dealer.