NA->TT FPCU wiring posted by Smokiedabear on October 25, 2016 at 09:08 AM
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IIRC the only difference is an additional wire/pin. On my 90 NA when I put in the TT FPCU, I was just going to run an extra wire from FPCU to ECU, but for some reason the harness and connectors were already populated. I checked continuity, it was the right thing, so I just put in the TT FPCU and ran with it.