1.) He may have setup the boost to read from WG by ACCIDENT. I've seen it happen before. I guess you don't have enough expierence to have delt with this before, and that is understandable. You're still a kid.
2.) Running the guage from WG boost will not show boost that's actually going into the motor.

Don't you have some young girls to stalk?

Edit: It is possible to have enough drop through the IC that reading WG boost is a good idea, especially when running higher boost numbers, because this could stress the thrust bearings if the drop is say 3psi. You're running 17 into the manifold, but 20 at the actual compressor. This being said, if the compressor is out of it's choke say around 19psi. You could be easily stressing the turbo to such lengths as damaging the bearings.

Go update your program boy. It seems to have failed Chris. Time to spend another half your life fixing the bugs, and not making any money off it. You are with out a doubt the stupidest intelligent person EVER to make it into the books.