What you actually need is the solenoid. The valve that opens and closes and either bleeds off, or pressurizes a port in/on the wastegate.I'm fairly new on here. i've been a skyline GTST owner for a few years and now have a GTR. To up the power, why do you need a boost controller as well as an ECU like an Apexi Power FC?
The Power FC can control their solenoid with a plug in harness.
Other ECU's, all depends. But most can be setup to control the solenoid. I like to do it all in the ECU with no out board boost controller.