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1) this is the vehicle speed sensor. You can leave it disconnected. This wire connects to a Reid switch in the back of the instrument cluster. I’ve heard of a GPS unit being used too. 2) These are for the rad fan relay. I only remember one wire for my Gen1 loom, yours might have a two speed fan setup that’s a little more complicated. But you might be able to run a fan off each relay with the ECU triggering them as needed. Hopefully someone else will know for certain what’s what here. Mine is an ‘88 series 2 and had the Reid switch behind the cluster in a carb model, if yours is a series 1 you might not have this, best to pull the cluster and have a look. 3) Neutral wire I believe you can leave it disconnected. I recall leaving my one disconnected and don’t have any issues. All the best with it! Ensure you finish off all the things you want finished before you start driving, otherwise they’ll always be lingering! Your very close now as you know Cheers Bennie

The SPFI is quite reliable. I would adapt it to an EA81 if you have the engine and spare parts to do so. It's been done and documented 15+ years ago. GD

Check all the connections, clean and tight. Load test on the battery. Have the Alt Tested.

Overfilling oil may have overloaded your catalyst of damaged your oxygen sensor. Has your fuel mileage changed? If engine oil was overfilled, you can probably find evidence of it in the vent lines and airbox.