'91 420 SEL. Forgot to add this to my original post on the odo not working. When turned the odo reset button is also the dash dimmer switch. It has stoped working as well. I know the general consensus is broken gears, but could this be a switch problem? Or, is it just a coincidence (long odds) they both failed at the same time. Haven't had a chance to pop the dash and have a look see.

TIA, Dave