How's this sound? Read rpm, 2 engine temp, controls the solenoid and an air pump (for whatever reason you want) s.port telemetry for everything and we'll figure out an air pump algorithm at some point or repurpose the control point for a future use. I could also make it take 5 engine temperature measurements if I try.

This makes it a single device for controlling our engines and keeping track of how they are running through telemetry and it's own integral display. Depending on final dimensions I may use a 64 row display but only if it doesn't make the package bigger.