Two questions:

I assume that you want a really clean source for the EBC.

1) Is it more desireable to have the EBC signal source before or after the throttle body? If before-tap into the outflow of the IC or charge pipe going to the TB? If after, see #2

2) I'm out of ports on the manifold so can the EBC share a port/line with another output? I have the brake booster port going to the brakes and MAP sensor, the rear extra port is on the boost gauge and cruise and the one on the front of the mani going to the recirc BOV.

 

There was an EXCELLENT thread about exactly this in which Joe Perez and a few others have basically laid it out bit by bit. I'll try to find it.

*edit, here is one thread but not the one I'm looking for, I'll keep searching:
https://www.miataturbo.net/forum/t32671/

 

It was linked in that thread.

https://www.miataturbo.net/forum/t32479/