On the wiring harness on the back of the motor there is a small black ground plug, I can't remember where it plugs in. It's not the one higher up that plugs into the firewall ground.
Anyone remember? (I'm trying to save myself a plentum pull)

 

This might help, it shows up in multiple threads.

 

You mean a ring terminal that goes underneath a bolt head?

 

I just started looking around and found it, sensor plug. Thanks for trying to help, most appreciated.