I was reading the real L-39 manual, and the way they show the location of the instruments is brilliant.
They always show a small simplified view of the panel on top, with the location of the referred instruments clearly highlighted in black. Like this:
I love the MiG-21 manual, but those references to panel positions (i.e. CU11, RV37, CM84...) are a real pain.
Just a thought :)