OK, so to look at the commercial prospects as JonW suggested, I looked at the BCS. It uses RTD probes. Do not want to go that route, as I have made my own one-wire sensors with ss tubing, waterproof m8 sensor cables, and DS18B20 sensors. MrShake, I looked at your Brewtroller, and it appears that the brewtroller is based upon a similar platform as what I have already built. Jimmayhugh's DYI project uses a teensy 3.2 and arduino code, and an esp-01 or a Wiznet 820io with a travel router for wireless capability, and RGB lcds or touchscreen, and has PID programming which I think is gas-friendly. I am looking hard at my project on what to do next, and to the credit of jimmayhugh who has helped and supported me as I went, I think the real issue is the arduino coding, and whether it provides what is needed to control a gas system. I am not able to connect to the router to get to the webpage, and remains my only issue. Even after I reprogram the esp-01 with a breadboard, this system is still untested on a propane setup, therefore I thought I would ask around for other options using the stuff I have already built. I hope this helps explain my situation.