Too bad we all aren't driving propane powered forklifts. They have nifty gauges built in to the tanks. I wonder why 20-30lb RV tanks don't have the same thing unless the orientation has something to do with it. Forklift tanks are horizontal when in use.
Maybe Hank Hill could chime in.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.