Which Vacuum source?
 

Blue = FPR line T'd to BEGi (have been told to both use this and not use this)
Red = Goes to BPV, by pass valve and T'd to the retard box.
Green = Not T'd, goes to charcoal canister solenoid (I'd like to use but would like confirmation)

Question: Which line should I 'T' into for a boost gauge?

One that sees boost.

Used the charcoal and works fine.

Mods feel free to delete.