Good evening everyone. I kegged my first beer tonight night. Once all the beer was into the keg I hit it with 30 psi and sat it in my refrigerator which is set to 40. I tried to set the regulator to 10 psi but it wouldn't go any lower than 30 psi. Is this because some of the co2 needs to be absorbed into the beer before the pressure Gauge will read any lower or do I have a faulty gauge?