7Al-3 Control With Start Retard, 3-Rev Limits And A 4-Stage Retard, The 7Al-3 Has All The Features You Need Plus A Rpm Activated Switch MSD IgnitionSomething new is that the start retard is now adjustable with plug in modules giving you better control over the amount of retard pulled out during cranking. The unit is supplied with a variety of rpm and timing modules. It is has a foot print that fits into the red 7AL 3's mount. For racers that want adjustments at their fingertips, the 7AL 3 is the right choice. The 7AL 3 packs high voltage with four step retards, three rev limits and an rpm switch.