EFI wrap up
After situating the fuel system, we needed to finalize the EFI wiring. We had figured out all the pins needed and the general layout of the harness. Plan done, execution needed.
First, mounting the ECU. We wanted it easily accessible but not exposed to too much heat or potential moisture. Built a small stand for it off the passenger floor and then built an extra grounding strap just to be safe. After that, punched a hole for the factory EFI harness and grommet to fit and viola… almost like Mazda intended: