My guidance is based upon the '86 SDL. The function is similar, however, the '85 CA is a unique beast and what I have with this one may differ slightly:

The first photo shows the VCV. Two lines enter the top of the VCV. One line is the supply vacuum and the other is the modulated vacuum for the amplifier (VA).

The second photo shows the VCV. Down low on the side is the vent line. It's not very visible in the photo, but, it heads inside the cabin.

The third photo is the top of the VA. The central port is supply vacuum. You can see a T just before the port entrance. The supply vacuum continues into the cabin for accessories. The side port is the transmission line.

The fourth photo shows the following:

Coming from the VCV, the hose splits at the Y:

One leg of the VCV output goes into the solenoid.
The second leg of the VCV output goes to the bottom of the VA. There are two ports on the bottom of the VA. The port that is offset to the side of the VA, on the bottom, is where this line connects.

Going to the bottom of the solenoid is a line from the manifold so the solenoid can receive manifold pressure.

Finally, there is a line from the solenoid (horizontal port at the top) to the bottom of the VA. It connects to the port that is dead center on the bottom of the VA.

Hopefully, the '85 is similar.

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