Ok here is my first question, I hope I dont look like a totally dummy asking this one... Here is a picture of my propane guage. First off, the owner I bought the camper from alerted me that it might be broken, so it might be stuck at 1/2 anyways. But how do you read this thing? Looking at this gauge it looks like when the needle is on Full, the bottom would read "OK", however it also looks like if the tank were empty it would read "OK". Am I nuts? It might be time to upgrade anyways. Is the general wisdom now to upgrade to the upright tanks? I seem to remember something about these vertical ones no longer being made?