Gauges stopped working!!!
 

After starting my '88 300CE last night I noticed a high pitched whine form under the hood bye the pedals, then noticed that all gauges but the speedo and economy gauge were not working. Lights work, car ran fine, the fuse is OK. What could cause this?

Check the fuse again, likely it's cracked and will fall apart when you take it out of the fusebox.

If the brake lights work, there is something wrong with either the wiring or the cluster itself. Stop lamps are on the same circuit, as I discovered by nearly getting rear ended!

Might also be the OVP, but I'd be surprised.

Peter

Replased the fuse. No help. That high pitch whine is behind the instrument panel. Any ideas?

There is a strange twist-in fuse in the back of the cluster, it has a red base and the fuse is like a printed circuit board. You twist the red base out just like one of the bulbs, it'll be about the only thing "red" you'll see back there. The fuse itself (the circuit board-looking thing) will just pull out of that socket once it's removed.
Gilly

I got this problem the first day the car came home. I took out the fuse upper tray to access the relays below and it was indeed a buzzing relay (can't remember which). I thought it was the relay and opened it up to inspect for broken solder joints. In the end turned out to be faulty fuse or fuse circuit.

Either way your problem may be somewhere in between.