MSD-6AL-2. 2 built in limiters, one is a basic rev limiter ie. 6500rpm, then you have an additional rev limiter 12v activated. Easy install, took a decent amount of dial in. See my other videos for more
If it has 2 separate rev limits that's essentially what you need to run 2step. Hopefully one is easy to install a switch to otherwise you wouldn't need 2 separate limiters.