Propane valve

[CygnusSailor]

OK here's a stupid question...My wife and I are living in the 5er for about 5 months this winter. This is the first time we have spent a long period of time in the camper. The question has to do with the propane tanks...Assume I start with two full tanks and turn both of them on with the arrow pointing at the forward tank. The window indicates that the tank has propane in it and we run a week or so on that tank. When that tank runs out the valve switches automatically to the aft tank and everything continues to work. Here's the question...Should the arrow switch so that it is pointing at the aft tank or does it still point at the forward tank to indicate that it is empty?

Thanks,

Gary Harkins