Could you use one of those ports for a boost gauge pick up? where is a good place to install the boost pick up in a stock intake system?

 

To answer your first question, Yes you could.

In the stock intake system, you could get a "Boost Bolt". It would replace one of the bolts in the intake plenum.

This is the basic idea, check with the vendors here to see if you can pick one up from them.

BD-Power Cummins Boost Bolt Adapter

 

I just drilled and tapped my stock intake for the sending unit, works well.