ok i just got in my kegging system today. I screw on the dual body regulator to the tank really tight and a turn on the gas and co2 just sprays out and makes a loud hissing noise as soon as i turn the knob. and the presure valve for each line is in the off position (left). also the high pressure gage doesn't move when i turn the gas on all the way. i do not know what i am doing wrong. please help! thanks!