My odometer and trip odometer went out @180K mi., but I am happy to report it is now back up and running thanks to this forum - especially Chris W. and his "Let's Pull the Instrument Panel" post (with pix) and Steve Brotherton and his brother Scott who repaired and refurbished the instrument panel. Thanks very much guys!
(Scott also replaced my instrument panel bulbs - and I am surprised at the improvement this makes ... I am not used to a Mercedes instrument panel with other than dim, dimmer & dimmest settings.)