Try Andy at Clarkson Fine Cars (who I use.. tell him Neal Bhatt sent you) or Charlie McNally (search this forum for his contact info). If anyone can repair it, they should be able to.

I'm not sure it will be cheap though.. have you considered just buying another one? I know you can't get one from the US (since it will be in miles) but I've found the German ones are exactly the same and are in KM.

Perhaps you could buy this unit and swap out your odometer?

http://cgi.ebay.de/tacho-kombiinstrument-cockpit-mercedes-db-123-250_W0QQitemZ140005313290QQihZ004QQcategoryZ9895QQrdZ1QQssPageNameZWD1VQQcmdZViewItem

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)