1.) There's something wrong where you tapped the gauge
2.) There's something wrong with your gauge.
Where do you tap in for the gauge? You may be getting wrong readings or you have a hose that's leaking.
The car DOES make 14(ish) lbs of boost at full throttle in 2nd, 3rd, 4th and 5th.
1st gear on stock ECU with no boost control is around 7lbs. It's designed that way.