So, I figured out how to get the valve to show 0 again, but when I open up the pressure tankside, the low pressure gauge will show around 25 psi and then start lowering as I open up the needle valve more.
Okay, one more idea. Maybe I'm misunderstanding how this is supposed to work. Is the low pressure gauge supposed to measure the internal pressure of the regulator or the output pressure? Because if it is the internal pressure, then this makes sense, since greater output=less internal pressure, while the high pressure gauge measures the pressure inside of the tank?
Btw, I have a 5lb aluminum tank, and the tank pressure is sitting at around 600psi. Is this normal?