You would have to feed it from both tanks and get it PERFECT... and PERFECT might change from time to time. I would just get a new regulator. See if you can find a used Tunze on eBay or locally on a board or Craigslist... I have bought a few recently for about $50 and they are as reliable as the Carbon Doser or $1000-1500 (whatever the dude spent on it) Custom Victor with Oil Filled Gauges that I have... not as fancy, but they work the same. They need a check valve... for sure. We don't lose power here very often and I also have CaRx that won't melt the media if the co2 still runs in an outage, so I have never put solenoids on the Tunzes... but some might have to. There are plenty of others that work well too.