So, it is the line that goes into the bottom part of the transducer that I need to take the measurement at? Before it gets there, there is some kind of switchover valve that the line from VCV feeds into.
Also, should I not have the 12-15 range coming out of the transducer ,at idle, to the transmission regardless?
At this point I'd like to understand how are the vacuum lines supposed to arranged between the VCV and the transducer(blue soucer thingy).

There is only one line from the VCV to the transducer. That line will be interrupted by the switchover valve (used for cold starts), but won't affect your results once the engine is warm.

You should have 12-15 at idle going to the modulator, however, since you don't have it, we're trying to determine where the problem lies...........but, without your capability of making this test, we can't accomplish that.

OK, I will get the read from the correct line as soon as I get back to the car. What is the expected read ?

It should start out fairly high...........15" or so...........and get proportionally less as the pedal is pressed further down. The gauge must be observed while driving the vehicle and the various vacuum levels noted during various operating modes of the vehicle.

Thank you for all your help so far. Sorry about the initial confusion- if I only knew how to read... Bottom of the transducer is marked "VCV" for the line in question.....

That's the line.........put a gauge into that line with a T.........and watch the gauge while you drive it.

Will report back.

OK- 23 in/Hg coming into VCV, 3 in/Hg going out. Pulled the vacuum on the VCV and it is not holding. Please advise. Thank you.

Unless you have a leak that is downstream of your T, the VCV is NG.

Connect the vacuum gauge directly to the output of the VCV, instead of using the T...........see what you get when you drive it.

I will do that test tomorrow (getting dark already). Is there anything that can be fixed on that valve? Are they pretty expensive?