Features Switch to a lower RPM limit to use on the starting line ¨C with an MSD 6AL 2-STEP Rev Control Digitally controlled, it connects to your existing MSD Digital 6AL¡¯s gray tach output wire Features two rotary dials with which you can set the launch RPM in increments of 100 RPM Activation wire connects to the transbrake, a clutch switch or to the line-lock to activate the RPM limit When that switch is released, the low RPM limit is turned off and the car is launched Legal for use on non-emissions controlled vehicles, as well as race applications Your MSD 6AL 2-STEP Rev Control is backed by a limited warranty DescriptionSet a lower RPM limit for optimal race-day performance with the easy-to-use MSD 6AL 2-STEP Rev Control. Legal for use on your speed demon as well as non-emissions controlled vehicles, this top-of-the-line component features two easy-to-read dials front and center, which allows you to set the launch RPM in increments of a hundred.The activation wire hooks up to the transbrake, a clutch switch or the line-lock to activate your limit once it¡¯s been set. When the switch is released, the limit turns off, leaving you moments to brace because that car is going to launch hard.Your MSD 6AL 2-STEP Rev Control is supported by a limited warranty. Manufacturer InfoReturn Information