"It's manual, and I don't have a boost gauge. I'm figuring I need to buy one and hook it it up asap?"
With a boost gauge installed you will be able to diagnose weather or not you have a Vac or Boost leak, if neither of the two are apparent it could be something as easy and a solenoid that needs cleaning, sometimes the turbo inlet pipes crack/split which can cause a whole hell of a headache, again if you find something wrong replace it with a part that is new, the last thing you want to do is rip apart most of the motor to find that it all needs to come back off again at some stage because the 2nd hand part you installed failed.
Alot of the time the plastic piping under the intercooler crack/split, I suggest replacing these if you pull the intercooler of as they are restrictive standard and they are a prick to put back on.
I am fairly new to this forum but I believe there are quite a few people that have posts up about how to do most things related to these motors.