takata, remember when you are training with the aircraft instruments that this is not a whole lot different in concept than walking. You use organic instruments to assure your position, attitude, and direction. This includes eyes, ears, semi-circular canals, and proprioception. If it's dead black, say inside a closed room in a power failure, you still have the other senses. You can even get down to proprioception, the sense of your own body's position, you can still walk and get yourself to the door.
Proprioception is demonstrated by closing your eyes and alternately bringing your index fingers to your nose. It is also your sense of the pressure on the various parts of your feet when you are standing. When trained up it is a marvelous instrument most don't know they have. Are the plane's instruments all that much different aside from the lack of a direct nerve connection? You should be able to learn them so well they are a part of you as much as your feet are a part of you.
Sermon ended.