If you are going to do it, do it right! This sport is not one that you can slack off, get lazy about following procedures, routinely checking equipment, etc... Taking shortcuts and neglecting your equipment WILL eventually lead to a bad situation to say the least.
I for one never leave for tomorrow what needs to be done today. Even with "little" things like washing your gear down with fresh water after diving. Believe me I see many divers who get home after a dive somewhere and leave their saltwater drenched equipment in the garage for a few days before washing it! I don't care if I get home tired, exhausted at 3AM... First thing I do is wash it all down and hang to dry.
When it comes to oxygen sensors I know they can be expensive for some, but if you can't keep up with maintenance why do it? It's not worth the risk. Go back to using OC and it will be safer.