Well, I don't know exactly how to read the instruments, but there is this aircraft guide that might help:
http://www.scribd.com/doc/6291510/IL...Aircraft-Guide
It's for IL-2 1946, but the layout of each specific aircraft cockpit is the same for 1946 and BoP obviously. Just click on the aircraft name in the index.
Also, the altimeter is always the indicator with 3 needles of different sizes, regardless of aircraft. The speedometer can be complex or pretty simple depending on the aircraft.
Sorry I can't give any specifics though.