With an external here's how you do it. You've got 2 ports on the gate, one upper and one lower. Run a hose straight from the turbo to the bottom port.
Now for the upper wastegate port you will need to find another source of boost such as the manifold or like my friend's truck he has aluminum intercooler piping so we just tapped into that. Now run a hose from that second boost source to the black solenoid box that comes with the Blitz. That goes to the IN and then run a hose from the OUT to the top port on the wastegate.
Hook up the wiring and make sure the controller is set for external. Also you will need another source of boost (can tap into a vaccum line like the one that goes to the fuel pressure regulator) this one goes to the actual controller unit and tells the brain how much boost there is.
Now you will need to fine tune the gain and volume. The gain controls how fast the boost builds. You'll want to set it so the boost builds pretty fast but if you set it too high the boost may spike. The volume is based on a percentage. At 100 it will keep the wastegate closed and build up as much boost as your turbo can build. My friend's truck runs around volume 30 for 15psi of boost, not sure what the gain is set to.
Hope this will help you out some.