@mac64
Doing that, you would have the DIY version of exactly what I described: a mini ox 3000 with an external oxygen sensor! The thing I appreciate about the mini ox is that it has a larger display, and also a high limit alert with blinking lights and loud beeps. I wouldn’t pay much for that feature, but if it came along for the ride, it’s nice to have.
A very nice feature on the mini ox 3000 is the high limit alert. I removed the led and wired to to a manual reset dead man switch. When the high limit light goes off, it drops my o2 feed into the stick. It was a very simple safety.