Propane Tanks

Hello I have 2 40 lbs propane tanks that I purchased new from northwest hardware late in 2021, with the camco dual stage regulator automatic switch over, u can turn dial for left tank or right tank, not sure why that's there but if the dial is pointed down, that's the auto switch over when one tank is empty automatically switches to the other when both tanks are out, the arrow on dial turns red, we used the setup on our gas range, we were just waiting for natural gas in our neighborhood we have it now so no need for this setup, depending on cooking style we just filled one tank back up in March both were empty so it last a long time. Perfect for grills. Rv, camper, gas range, I have well over $300 in this setup no low offers it doesn't hurt my feelings if I they stay in the garage everything is like new condition, they were enclosed in my wife's she shed so no weather every got to tanks. One tank is full Jonathom