I think you two are confusing eachother. The sensors shouldn't have anything to do with the NLS should they? Wester's should be able to add it to any tune, regardless of the upgraded MAP sensors. Heck, I have had NLS since I bought the car (oh, yeah, I have an automatic. sorry.)
Still, I don't think the sensors have anything to do with it. Check the parameters of the NLS requirements, and then try harder.
GJ