This the clutch cancel plug. Because this is in an auto, there is a jumper installed in the end to complete the circuits
You would remove the jumper, and just plug the harness into the clutch cancel switch on the manual pedal assembly. Of note is this is a late model 96; the color code might be different depending on model year.
And here is where it is located in my 96:
This is pretty much looking straight up under the dash. The steering column is to the left of the pic, and im pretty sure thats where the door chime module used to be. You can see the plugs for the OEM stereo amp that i also removed.