Yep, the amal goes straight back to the ecu, the ecu does PWM to flick the amal valve open and closed about 10 times a second to modulate the boost. Initially the ecu keeps the amal shut so the actuator doesn't see the boost, this lets you overboost. Then the ecu starts doing the PWM to bleed off some of the boost so that the actuator only sees some of it, by altering the amount of PWM done the ecu can limit the amount of boost you get. Finally if the ecu thinks the boost is going OTT then it opens the amal wide and lets the actuator control the boost on its own limiting you to whatever the static spring loading is set at. In your case, with your rod length that's 11psi.