Air Conditioner Pressure Sensor

There was a post in the automotive forums recently talking where to find the air conditioner pressure sensor.
 
I tried to take a picture of mine (2001 Chevy Venture), but I could not see it because of other various components that were in the way.  So I decided to use the drawing below from the maintenance manual.

The manual also says that it is replaced by coming from UNDER the van.  So I think it is just below the Air Filter housing.  Man, it sure is tight quarters under the hood!