These pills work with the autobox addon for the airshifter setups. I had a autoshifter and used the 10,800 pill. You can also get the dial switch which gives a broad range of choices. Go to
www.msd.com or
www.mpsracing.com if you get the autoshifter get the button override so you can still shift on the button. This helps if you spin the tire, you'll have better control.