How are you setting up your ITB's as in do they connect to a intake manifold or do you just have the trumpets to atmosphere?
If you are running them with a intake manifold then you should just need to tap into the area around the intake near the filter and run your vacuum lines from that, someone correct me if I am wrong.
If you do not have the manifold then this a bit more involved you will need to install an after market engine management like mega squirt and run a MAP sensor. This way you do away with the ICV and vacuum hoses.
This is how I understand it works but if someone could please confirm this that would be great.
Hope this helps a bit.