I connected this to 2) 40# cylinders for my fireplace and antique stove. I also bought 2 pigtails to connect to the cylinders. The indicator will glow green when there is gas in the cylinder it is pointing to. When that cylinder becomes empty, the controller switches to another cylinder. The pointer does not move and the indicator is red. Turn the knob with the pointer to the propane tank and the gauge will turn green and the empty tank can be removed for refueling. The controller works as expected and I would buy it again.
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