lo throttle and hi throttle. the top engae/disengage boxes are for lo throttle and the lower boxes are for hi throttle. basically you can set the lo throttle engage higher if you have short gearing so that you don't go in to vtec while cruising on the interstate or something.

 

There goes Blake, making UD all intuitive once again.

Lo throttle in the UPPER box and Hi throttle in the LOWER box...makes sense :P