The way it's supposed to work is that you leave both tank valves open and point the switchover valve handle at the tank you want to deplete first. The indicator should be green. When the first tank pressure drops to a low level, the indicator turns red and the switchover valve starts using the other tank. You then flip the valve handle to the tank that is now in use, remove the empty tank, refill it and replace it. The indicator will be green again because the tank the handle is pointing to has good pressure.
I realize this is extremely confusing for some reason. My dad has never been able to figure it out. He always closes the tank valve on the tank that is not in use, which completely defeats the auto switchover function.
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