I would start with about 1.000 to 1.030. That should get you close enough to figure out where you need to set it. Just do the math on your reaction time compared to what you have in the box. If you set it at 1.000 and have a .025 red light put the box on 1.030. If you stage and react the same and your car reacts the same that should give you a .005 light.