Amazing, so many have NO idea as to dial back and what it is actually designed for.
Dial back is a correction device to reset the timing correctly when an ELECTRONIC timing curve is used in an EFI system, because there is computation lag while the EFI computer computes the timing setting as the engine runs.
Oddly enough, there is NO computer lag in any analog distributor (using mechanical, and or vacuum advance curves) so, granite heads, since there is NO COMPUTER LAG IN AN ANALOG SYSTEM, NO TIMING LIGHT COMPUTATION LAG CORRECTION IS NEEDED/USABLE
Also, MSD multi-spark does not compute timing, it fires the initial analog timing, then creates more timing events after that. As RPM's rise, the number of multi-sparks reduces to one spark per event, per cylinder after around 3K RPM's. There is NO computer timing correction, they first fire as the distributor advances tell them to.
And, on the useless final tune device known as a dyno, it gets even worse, they never time, nor jet correctly for street use, only for power contests with other dyno heroes. Dyno's are GREAT parts systems development tools, abysmal as a final tuning device.
The great part of a dial back system is, the dial back works with an EFI computerized timing curve, and when sensible people that actually think of the way it actually works, can leave the dial back dial OFF, to work with analog systems.
Look up the definition of "Whirling Dervish", more than a few that believe a dial back is so special for an analog system, are whirling in circles dancers..
As I said, AMAZING.