look here
http://www.alfaowner.com/Forum/tunin...ct-tips-2.html (2.4 JTD FMIC project - tips)
on the pic of the top of the engine, follow the black boost pipe to the alloy elbow that sis attatched to the inlet manifold, I removed this and tapped it here.
That way its a good solid point to tap into, and its only an elbow if it ever needs replacing.