I replaced all the o-rings about a week ago. I also vacuum tested the system and had no leaks.I would think that with with the same pressure in the system that that would also indicate no leaks which is why I checked the static pressure because that at least shows me the system does have some pressure in it. When you say "force" the compressor to turn on, what do you mean? My compressor turns on when I press the a/c button. I can see the clutch turning. Also I can hear the faint noise the compressor makes from inside the cabin through the vents.

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1990 190E 3.0L