I have this boost controller (bleed valve style) that is like a "T" shape but has the **** on the top and the two sides have fittings where the hoses go into...on the bottom, it there is an arrow pointing from one fitting to the other...my question is, which way do i install it? I know one side goes to the side part of my tial wastegate, but which direction is what?

Intake manifold ---> Boost Controller ---> tial OR
Intake manifold <--- Boost Controller <--- tial

 

Your Tial wants to read boost pressure.

IM --->MBC--->Tial

 

so the arrow at the bottom of the MBC should be pointing at the TIAL wasegate?