BenzWorld Junior Member
Date registered: Sep 2004
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RE: 1985 300SD
"As you can see these are all minor jobs ..." - hahahahaha...
There's an extractor tool you can borrow or buy to make simple work of removing the stereo. Maybe your local Good Guys or Circuit City will oblige you. If you prefer the brute force approach, pull out the ashtray, remove the two screws along the bottom of the ashtray frame, pull out the ashtray frame (it'll only go out so far because of the wires), reach in behind the stereo and push it out.
Never pulled a front door panel.
Get a can of Caig Deoxit spray. It's not cheap at ~$10 for a marker pen size can. Spray into the exposed edges of the switches then rock the switches back and forth for a few seconds. Rinse, repeat. That'll probably get the switches working. If not, You can pry the sunroof switch from the wood panel if you're careful. Otherwise, remove the stereo, remove 2 screws along the upper edge of the stereo cubby frame, pull down and out the panel that contains the ACC switches, push out the sunroof switch. As for the window switches, if you mean the ones by the shifter, remove the ashtray frame, slide forward the shifter console panel, lift enough to get access to the switches. I don't think you can pry out the window switches from below. If you mean the window switches on the rear doors, either they pry out or the black plastic piece they're on pries out.
To pull the gauge cluster, obtain the gauge cluster puller hooks or get a couple of lengths of stiff wire about 8" long. Bend the wires to form a 1 cm barb at one end and something your fingers can hold at the other end. Send the hooks into the sides of the gauge cluster between the gauge cluster and the dash hump about halfway up each side. Don't nick the dash hump! Turn the hooks so the barbs catch the gauge cluster and pull outwards. Give it a good tug. Not impulse but steady force. The gauge cluster should release and come twards you. Now, I've never done this on an older 126 so I don't know if the steering wheel has to come off. I don't think it has to come off. Pull off the wires and connections then take the gauge cluster to your work bench. It should be obvious how to replace the bulbs. Do a search on the replacing the dimmer potentiometer and cleaning the illumination optics. You might as well do a search on repainting the gauge pointers.
If the switches above the ACC controls don't light, remove the panel that contains the ACC controls, remove the wires and connections, then look for something that looks like an octopus with black wires for tentacles. The head of the octopus is a bulb and the tentacles are fiber optic cables that run to the switches. I think the hazard light switch has its own illumination.