The Brother PTouch laminated label maker works wonders. The labels stick to all the hoses and wires even after your nasty fingers have been all over them and the labels don't soak up oil like masking tape and sharpie. People laugh at me because a leave all the little white labels still attached but you never hear me asking where does this go?

X2 on digi pictures, you can print them, blow them up, write on them with sharpie, and then thumbtack them on a board for quick reference.