middle nipple/port is to left alone...... here is a diagram for internal wastegate setups.
I googled for less than 5 mins and found your answer. Definitely dig a bit, answers like these are definitely out there.
although this is for a manual boost controller, it's the same thing for electronic.
Technical Articles | Manual Boost Controller Installation | Turbosmart USA
for that model boost controller
http://www.jegs.com/InstallationInst...17-30-2400.pdf