[Gaz64]

Early analogue 6AL only had high speed limiter with a plug-in limiter module.

Simple, reliable, and easy enough to fit a 3000, or any other rpm up from there, since you can buy them in sets of 10.

The later digital 6AL has high speed limiter, and a user selectable low speed limiter used as launch control from a brake or clutch pedal switch input.

But the limits are set on the unit, and so anybody can change them at will.

If the unit is hidden, and your second drivers don't know about it, go for digital 6AL2.

There is also a programmable 6AL2, but then crossfire within the cap becomes a concern if you don't get rotor phasing correct.

Gary