The one thing that I was concerned about was that the Tach was not working... and I was thinking that this could have been an issue.
I got the Tach working today, and I still have no voltage at the pressure switch.
Checked the fuse in the fusebox and its good.
Is the a fuse somewhere else?

At this point I am chasing why I have no voltage at the pressure switch... without power there there is no way the A/C is gonna work.
Ideas?

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2009 Mercedes ML320 Bluetec