That might be a BEW. You will not be able to control boost with that turbo unless you make a custom actuator.
The OEM BEW turbo has a fully electronic servo-motor vane actuator... previous versions were vacuum-controlled.It's probably PWM, but dunno for sure. Some research will surely be required to control the vanes without the rest of the BEW bits and pieces... or it may be possible to retrofit a vacuum-controlled actuator.