just a straight thru connector [ Yellow……..……..1162760929 ].

At present I only have Red, White, and brown/orange while I cool my heals for the dealer [hopefully] gets the other three for me. On the InterNet I could only find the yellow one!

I found that the brown/orange reduces the vacuum a bit too much and both red and white not enough... thus my conclusion that one needs to have a full set to have the best chance at getting the proper vacuum balance on the tranny side where the VCV [on the IP] bleed off the vacuum seen by the vacuum modulating valve that sits on the tranny.

I see that later models have what is called a vacuum "dashpot" or "damper" on the line going into the VCV. These are cheap and so I might just give this a try as this should slow down and somewhat stabilize the vacuum the tranny sees as you vary the throttle.
What do you think?
Sam