Has anyone tried teeing off before the pressure tank? I need to move mine and it seems redundant to run new pipe and then go back. The pressure switch can stay (or be moved) in its current location. Any ideas?

You can move the tank, but the switch needs to stay relatively close to it, as within a few feet.

I'm assuming that is what you are asking. However, you might be asking if you can tee off between the tank and the pump. So far as I'm aware, as long as you are after the check valve (between the CV and tank) you will be alright.