Pertronix ignitor III rev limiter sounds/feels like ???

UOP said

Set it low, like 4k rpm if possible, and hit it. You'll know if/how it works without risking damage by over revving.

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Ok ... I think I got this pertronix III figured out ............ I changed the limit from 5400 to 6000 rpms and took it out for a blast thru the gears .. Well... I could tell by the engine sound that the rpms were still climbing towards 6000 rpms from where I had it set at 5400 before .. So these units DO NOT pulse or pop pop pop. It just stops at where you have it set and does not rev any higher.
I even called the pertronix techs and they really did not know for sure what sounds or symptoms to look for when the limit was reached. go figure !
Ok ......... that is settled then !! now I feel better.