Just a few quick questions about boost controllers.....

Do they perform the same function as a bleed valve?
Can the 3rd outlet be used to run a gauge to tell you what it's set at?

I seem to remember my mate's R5 GTT having a manual boost controller and when he turned it up (At a standstill idling), the boost gauge would go up showing what the boost was set at. I remember seing it go from 10psi up to 18psi as he was turning it.

Any ideas???

Lee