So I've been busy on other projects, like repairing an RV-6 and purposely let my electronics projects drop off.
Since I made this, I've had boards made to support this.
It's quite basic, and I haven't tried flight yet. I recall when I set this aside, I had it mostly working on the bench, but it need further refinement and flight testing/debugging.
The core of it is up to 8 channels of analog input with handy through holes for pull-up/down resistors to match the most resistance sensor (OilT, OilP,CHT,EGT,OAT,MP...). For more complicated sensors that require special component, I have two I2C inputs. There are lots of really cheap I2C modules for pressure, inertia/gyros and magnetic compass. Basically you can build your own air/engine data collector.
Let me know what you think. I have a few extra boards I'd send to anyone who's serious.
Here's the GitHub repo on the very basic LCD display version of this.