I'm looking at information on the newer 6.7L engines that have the VGT. The actuator appears to be controlled by a smart relay and is on the CANBUS. Pin 1 is smart power relay feed. Pin 2 is actuator ground. Pin 3 is Data Link High. Pin 4 is Data Link Low.
FYI for those who were thinking about using one of these turbos and the actuator on them.