In my car I am using the MSD 6AL with the wire cut for a 6 cylinder. My box is wired and taped into the harness and would be a real pain to get out.
My builder has a new 6AL box he plans to put in this V8 truck and will let me use it. (can't cut the 6 cylinder wire)
My question is about rev limiting.
I want to hold my motor to no more than 6200 rpm. I believe if I install a 4600 chip that should hold me below 6133 rpm.
Does this sound right?
Also how do dyno's mearsure rpm. Do they just use a plug wire clamp?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

yes for the chip

I think that's how dynos measure rpm.....

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes