Ok, I'm gonna give you the basics, its a very simple thing to install so just take your time, double check everything and make sure you get the solenoid hooked up properly.
The first picture is of the pressure sensor. its basically a map sensor that the boost controller uses to tell how much boost you are getting. MAKE SURE THE NIPPLE FACES DOWN. you will want to tap into a line close to your intake manifold. Apexi suggests the fuel pressure regulator line but i would either use the nipple at the back of the manifold for the stock pressure sensor or the BOV line. ok next is the solenoid. It has 2 ports, one marked COM and the other marked NO. On your stock turbo there is a line going to the wastegate from the compressor correct? you want to take that line off and run a line from the compressor housing to the NO port. Then run from the COM port to the wastegate.
Now wire it all up and figure out how to set it up.
refer to this manual if you are confused in any way.
http://www.apexi-usa.com/pdfInstallation/21.pdf