When you take your first driving lesson, the speedometer is simple to read. There’s just numbers. Simple. No colors to worry about. The tachometer is a little more difficult, but not much. You just need to figure out why the end of it is colored in red. Red is bad. Okay, so maybe it’s not more difficult.
The airspeed indicator in a glider is much more colorful. There’s green, red, yellow and white. The first time I saw it I thought it was a Christmas decoration! I found out later those colors all meant something, something very important. It’s time to get colorful, with limited colors!