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i just read this thread last night. thought you might be interested before making your purchase. http://www.tahoeyukonforum.com/forum/showthread.php?t=14228
I think it is a back up in case of an odd tuned chip.I been running MSD for years "NO PROBLEMS HERE" good choice. Just wondered why the 6AL and not the 6A since the ECU will have control over the rev limit?
I think it is a back up in case of an odd tuned chip.
To late to change to the dizzy, but I got my box off ebay new for $180. Maybe next month.