These MSD 2-step rev controllers coupled with MSD's digital 6AL ignition box let you choose from two different rpm limits that can be activated at different times. For example, you can use a lower-rpm setting for staging and then automatically switch to a higher-rpm setting after you release your trans-brake or line lock. The 2-Step is also digitally controlled and connects to the Digital 6AL's gray tach output wire. There are two easy to read rotary dials that let you set the launch rpm in 100 rpm increments from 2,000-11,800 rpm. There is an activation wire that connects to the transbrake, a clutch switch or to the line-lock to activate the low rpm limit. When that switch is released, the low rpm limit is turned off and the car launches hard!
