Ok so I had a usuall problem on my 1995 E300D, tachometer dead, rough idle and AC not working. Took out OVP relay, (for some reason the relay only had 1 10amp fuse and 7 pins vs 2 10 amp fuses and 10 pins others have reported in their 1995 cars) the fuse was blown, replaced it cleaned pins and put everything back togeather. Tachometer now is working and idle is nice and smooth! I don't even think I need motor mounts anymore, but I have ordered them alreadyoh well will be a spare.
The A/C is still not working, does not look like the compressor is engaging. Any ideas? Could it be the OVP relay is still preventing the AC from working? But everything else works now...

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1987 300D
2005 E320 CDI

Can you test for continuity across the refrigerant low pressure switch?

Sixto
87 300D

Hey Sixto, I have the car now in the shop for 2 front bearings, will be picking it up on monday. I am not too good with the AC system, where is that low pressure switch located? Thanks

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1987 300D
2005 E320 CDI

I should clarify, I don't know if the AC had stopped working along with the tach., when I bought the car it had this problems already.

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1987 300D
2005 E320 CDI

The low pressure switch should be attached to the drier behind the driver side headlight. If things didn't change between 93 and 95, the drier has 2 pressure switches; one with pigtails, one without. The one without is the low pressure switch. If there is continuity across the low pressure switch, there is enough refrigerant pressure in the system to safely engage the compressor.

Sixto
87 300D