If all the other lights on the cluster are working, then it is the bulbs specific to the odometer that are out. The dimmer dims all the bulbs onthe cluster.

__________________
RSL007
1999 ML430
2001 C320 Sport
2000 SAAB 9-5
1998 E300DT
1998 C280sport
1991 300D
1991 350SDL
1982 300DT
1972 Porsche 911 Targa