how do u wire up/set up a 2 stage boost on a rs turbo??

if i remember right u have 2 cut intp the green/brown wire from amalvale & put a switch inline????

& set boost up to say 14psi on actuator with amal valve wired up/switched on???

that correct??

how does it know what boost 2 run when amal valve is switched off?? say 10psi??