Originally Posted by 82spukram

If you look at the PDF, while in cruise flight, your AOA is simply the the degrees of pitch up. Any other time you can pull up the flight path vector (which would be on the horizon in cruise) and look at its location and count the number of degrees on the attitude indicator between the FPV and your imaginary airplane. Also it's available as an option on the 737NG.
In cruise flights AOA is always 2 degrees for best range. 6 degrees for v ref, and if my memory serves me correctly 3.5 for best endurance.