Today I finally fixed the light inside the car 1982 300 SD at the instrument cluster and also removed the radio and ash tray.....when I put all back (by the way I just use sand paper on the reostat spring and like magic lights came on after 3 hours of guessing and testing a lot of wires), well now I have a lighted instrument cluster and I can see if I am in park or reverse at night and check my speed, temp, etc.
But the vacuum lock that used to work fine before the fixing of the lights is not working anymore, any body with the same problem?
Did I disconnect or break a vacuum hose pushing back something?
Any help will be greatly appreciated

Hey,
Do you have the W123 engine with the engine vacuum pump. Or the W126 engine with the electric vacuum pump?
I'm guessing you have the engine pump and you disconnected something when you were working on the cluster.

Danny

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1984 300SD Turbo Diesel 150,000 miles

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Is any other vacuum operated facility not working correctly?
The engine shutdown is activated by a valve on the ignition assembly. Working behind the istrument cluster may have dislodged one of these lines.

Did I miss something? I thought he was refering to the door locks.
Those lines are restricted so theoretically you could still have brakes and the engine would still shut off with a minor leak in that area.

A quick look through FastLane showed he has the electric vacuum pump in the spare tire well.
Maybe he did disconnect something behind the instrument cluster or maybe just coincidence?

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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It’s the engine Vacuum pump so it may be the w123, last night I tried the climate control and seems to work fine also the engine stops normal so it's back to the drawing board, this morning I will pull the cluster and check for a loose hose.

How can I tell if I have a W123 or 126 I am a liitle confused about this on my Haynes repair manual it says is a W123 but on the base of the spedometer it has some numbers and reads 126.542.4401

You have the W126 body. The W123 is the smaller vehicle and it does not have the "S" in the designation. I'm fairly sure all your vacuum comes from the engine driven vacuum pump on that vehicle.