OK, gauges went on this morning. Showed absolutely no pressure, BUT compressor still not coming on.

To verify the procedure :
- I connected manifold lines to quick disconnects and manifold set. I checked that manifold knobs were closed and quick disconnects were open.
- I connected both quick disconnects to the high and low ports on car.
- I turned car on, set to max cold, AC on, and blower on high.

The gauges showed no change from when they came out of (expensive!) box.

Should they be indicating some sort of standing pressure, even with the AC compressor not cycling?

Attached Thumbnails

 

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W201 1989 190D