As the engine warms up, a bar graph will move across toward the target indicated on the screen. As the engine has warmed up, you can adjust the mechanical idle speed until the indicator is centered in target. This centers the travel of the idle air speed motor. Once the engine is up and running properly, you can go back into the Advanced Options in the main menu and adjust things like the air/fuel ratio at Idle, Cruise, and WOT. This is where you also set the rev limiter.