91 convertible, installing my engine and just got the UIM on without the plenum and have a single wire connector coming from under the UIM near the alternator, Light green with Black tracer. anything under the intake that I forgot to plug in?

 

The Power Steering Pressure Switch is that color and it has its own plug. The wire runs to pin 1N of the ECU. If you did a continuity test, ECU plug unplugged, you could tell whether that's the wire or not. And the rear primary injector also has the same wiring color (LG/B).

 

Is it the aux. fan trigger switch?

 

still unsure lol, just got done and went for a drive. everything seemed ok so i will check diagrams tonight.