Dual propane tank switchover valve question

I agree with Fpoole, I’d rather not have the tanks switch over automatically, I want to know for sure when I’ve used up my first tank and am operating on my last one

Because it seems one propane tank always runs out at the most un-opportune times like in the middle of the freezing night,for example.

Then you do not have to restart all your propane appliances and smell the propane as they run/flicker out.

Same thing though,you have to go outside to check it once and a while..