Thank you so much for clearing this up for me. I'm sorry guys, and it's no wonder I always find myself on KP Duty. I've been slowly immersing myself for about three weeks now, and I completely misread the CO2 gauge. I thought it was an oxygen gauge and that it was some kind of emergency supply. Stupid is as stupid does. Ahhhhhh, live and learn, eat humble pie once in a while, count your blessings, and proceed. So very glad these forums are here.
Thanks again!