COBRADUDE

ok, another question about a 03 cobra, maybe someone out there has seen this too... got a 3.1 pulley swap on my 03 cobra, and there is a lunar meter boost gauge aftermarket that shows the car is putting about 16 pounds of boost under full throttle. Well all i have is a 3.1 pulley is that even possible?? The lower pulley looks like a factory ford pulley, so i am guessing the gauge must be wrong, what do yall think? DAN04COBRA chime in if you heard about this one before.. you have probably heard all this before i am sure.