[Cupcar]

The MSD model 6AL has a rev limiter built in.

I have used MSDs as Yoda recommends starting in 1989 on a Twin Plug engine. The rev limiter works very smoothly giving the engine almost the feel that the throttle blade is going over center and starting to close.

One thing though, stick with the Blaster 2 coils which have only a 140 milliampere current draw, some of the other MSD coils such as the Propower and HVCII draw as much as 2 Amperes!

The highest amp drawing coil that MSD recommends is their "Blaster SS" (in a single coil application) which draws 300 milliamperes; the Blaster 2 units work just fine since 2 X 140 ma = 280 within the 300 ma recommendation.

As an aside, I ran into an issue of misfire running a single plug engine on the dyno, it turned out that the problem was the output of a "Pro Power" series MSD coil fried the resistor in the Bosch rotor. Switching to a god old Blaster 2 coil eliminated the problem and the engine ran just fine.