Just for your info, Scale and unscale work only for the analog inputs and outputs of your IO. norm_X and scale_x are used in combination to be more flexible, and can be used to scale anything: analog IO, degrees C to F, mi to km, whatever. Norm_x normalizes the numbers, which means it takes the source and converts it to a 0.0 to 1.0 scale. Scale_X takes the 0.0 to 1.0 scale, and converts it to the engineering units you need.
The scale and unscale blocks work for what you are trying to do, I just wanted to answer your original question of what norm_x and scale_x are for.