75+ used 911 615 108 01: https://911-manuals.questionable.services/porsche-pet-911-mid-year.pdf
I don’t have a 73.5-74 PET but thus presume the -00 relay applied to those early CIS cars. The 74-77 PET doesn’t mention it.
74-77 PET denotes 75+
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1978 911 SC (3.2SS, EFI, 993SS cams + the trimmings)
Dynamic Comp Ratio calc: https://dcr.questionable.services/ • Gearset & Ratio calc: https://ratio.questionable.services/
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