Howdy Gents from Houston Texas,

I have looked over your projects with quite a bit of interest. I enjoy the hobbies of electronics, engines, and rc aircraft. I feel as though I have the skill set to complete and fly your system. As I read over the RCU, RCG, and Github I find myself having a
few questions as the design seems to be in evolution and the GitHub info contains separate paths when it comes to microcontrollers.

My Equipment:
1. I have a Spektrum 8 Gen 2 with 7 point throttle mix and can handle other programmable mixes as well.
2. My Saito 72 which is currently running on glow ignition is my primary target but I also have a Super Tigre 45, GMS2000 76 ring, Thunder Tiger F-91S, and a Magnum AR180 all of which hold futures in gasoline hopefully.
3. I own a 3D Printer
4. I'm already familiar and invested in Adafruit products.

My Questions:
1. The M-Tronic solenoid has different part numbers depending on where I read the information (RCG & GitHub). Which one do I need?
2. I would like to purchase 3 of the housings that fit the solenoid. Which one of you guys is the man for that?
3. Which microcontroller is currently recommended of the 2 options?

Moving Ahead:

I'm going to guess that based on my not very demanding single cylinder engine range that the option for me is the BME280 compensated solenoid. Unless I'm understanding it incorrectly the air pump design wont be required in my case.
Looking forward to everyone's input.