MSD rev control

I had a MSD 6AL ignition box that died, I bought a 6AL-2 with dual rev control.
My question is this, if I set the rev limit at lets say 6000rpms, will the engine rev normally to that 6000rpms and then just flatten, or does the limiter roll into that 6000rpms say starting around lets say 5700?
I'm just trying to understand how they work and where I would have to set the rev limiter in relationship to my shift light.
Author: admin