I had a VSS with the 5.3 and factory computer. It was wrong pulses for the Holley I wanna say. Didn't want to buy another unless needed. When I set up the 6.2 with the Holley, it sounded like I didn't need it. It worked fine with 400 turbo and no VSS. I think it's just for "additional features". I'm guessing that's data logging speed, nitrous related to speed, etc.
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