Where is a good spot to hook this up?

I have it t- into the same spot with my boost gauge and it seems to have a delayed opening. Is there a better/different spot to hook this up?

 

Anywhere on the upper intake manifold. You might want to use a source by itself.

 

Use a dedicated source, not a tee, like r-magic said; and try to use a smaller diameter line of the shortest length possible; this will decrease the problems caused by the line flexing & collapsing under vacuum. In fact, make sure that the line you're using is actually vacuum rated (a lot of pressure rated lines collapse completely under low vacuum).

 

What is wrong with using the stock vacuum fitting? There are several on the UIM, I see you are single-turbo so pardon my ignorance of all that has likely changed on your set-up....but it still seems to me that you have several options(?)

 

There are definitely several nipples left unused when you go single. I would use one of those. As mentioned the shorter the run the better.