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I can't get a pressure reading with my OC-1 on my tank until I'm in the water and descending. What is going on with that? I've tried everything I can think of and until I'm down about 3 feet or so, it won't tell me how much air I have in my tank. I did buy a separate gauge to check my tank, but it seems to me that the OC-1 should be giving me that reading once I turn the tank valve on. Help?