My car...er truck... has been running with FAST EFI for about 3 years now. I bought the harness kit that was the universal type- only terminated at the ECU end. I removed all of the wiring I was not using to neaten things up a bit. The connectors were no mystery to me, but I guess you could say I cheated a bit since I've been fixing cars for over 20 years. The wiring job was fun in a slightly sadistic way since I was combining the stock harness of a 94 Dodge Dakota with the FAST harness so that all of the stock neccesities would work.
edit: almost forgot- if you need more pins, sockets or the connector bodies, try Digikey. I bought some various items from them for the project including the parts to create a 5v reference source so the speedometer would work.
