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its just the stock harness has the metal pins similar to the ones you are supposed to solder and clamp the rubber seal/new pin. They just pop out of the stock clip and they pop right into older toyota/mazda injector clips, which then are a direct plug in to the new injectors. That way you dont fudge with the harness and can easily swap back to the stock clips without messing with wiring. It gets tight if you don't fully strip the injector harness to solder, and its a lot harder to do a cleaner job than what was done at the factory. I didn't want to unravel and break apart the plastic loom, so the limited wire and being stretched over the engine bay lead to reliable but ugly wiring.
When my tuner looked at my car, he told me I could've done that. It's an option and just extra info in case you want to go that route. BTW he said he pulled them from an 80s toyota for $1 or so.
Also for wiring, polarity doesn't matter as long as they are the same for all four.
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