i would like to suggest a very small change, but i think, it will improve engine management a bit.
Instead of display flap, mixture, power propeller pitch values in percentage, it would be nice to have the absolute numbers, for example:
For power, display the maifold pressure;
for flap, degrees, from 0 to the max of the specific plane, lets say 45 degrees
For pitch, RPM, where, depending on plane, 100% is equivalent to 2800 rpm, it means you have more acceleration, and for cruise, 2400 rpm, meaning a higher topspeed
and for mixture, fuel flow, escape gas temperature, depends on what instrument the plane had.
And if any of these values are exceded, a HUD icon can be displayed to warn the pilot, like already happens
I uploaded the power settings for P-47, for better understanding.