To be clear, are you wanting the object to point in the same direction as the stick? Or do you want it to rotate counter-clockwise when the stick is held left, clockwise when held right, something along those lines?
EDIT: If it's the former, here's an example where the object faces the direction of the stick and the position of the stick is limited. I made no assumptions about which side of the sprite is which, so you may need to adjust its angle by plus or minus 90 degrees.