thanks for all the replys anyone have a pic of a pcv vavle

is there a way of testing if mine is on its way out or its shot
ive just installed a new boost gauge as the one i bought was cheap the car seems to run well but i dont think the boost is rite!!
if i give it the beans around 4000rpm in 3rd i just about get 7psi i do notice the boost tailing off from time to time
sorry with all the questions new to the 18t and now i have one i want it running right