Be careful here. The TiAL wastegate works OPPOSITE to a normal built in waster gate. Supplying pressure to the top nipple INCREASES boost, and conversely on a built in wastegate's actuator, supplying pressure to the nipple DECREASES boost.
For you boost controller you want to connect NOTHING to the top nipple, then on the lower nipple you connect the pressure signal FROM the boost controller to that. The the sighnal TO the boost controller should come from the INTAKE MANIFOLD.
