Mystery Engine Plug???
 

Can you please help me know what this plug is.
http://www.topgearphotography.com/plug.jpg
http://www.topgearphotography.com/plug (2).jpg
http://www.topgearphotography.com/plug (3).jpg
http://www.topgearphotography.com/plug (4).jpg
it's between the firewall and the engine.

Bob should be able to help you when he sees it. But to help us a bit more I see its a 96. What engine? 2wd or 4wd?

The red part looks really really clean compared to the dust/grime on everything else. Did it just come off something?

I think it's the connector for the trans subharness that goes to the VSS, oxygen sensors, etc. Need more vehicle info.

It's a 1996 Ford Ranger xlt 2wd 3.0 v6

Yes, that should connect the engine harness to the transmission subharness.

Well all I can say is whip out that Haynes manual and figure it out son!