where exactly is the line tapped for your boost signal?
Is it here?...



Don't mind all the loom and crap. :P It's all been long gone. I took this pic about a week after I had the car.
The pressure when you take off the gas cap is normal. In fact, if you didn't have the system pressureized, that too would throw a CEL.
I think you either have the tap in the wrong spot or the knocked off/loosened a line by accident.
Don't give up and sell the car so easily, this is a minor issue...