Hi there,
You can try your luck at Nature Aquarium. The Taiwanese made JBJ brand of solenoid regulator is pretty cost-effective. There are other brands but I can't recall their names at the top of my head. A twin gauge would provide you with both the internal CO2 cylinder pressure (you'll know that it is time to top up the cylinder when the pressure starts to dip) and the external CO2 pressure (I haven't used much of this tough).
Good luck.![]()
Bookmarks