I just received my newly refurbished t-5 from a reputable guy off of the corral, everything looks good but i was looking it over and noticed that my old t-5 (borg warner) had a plug coming out of the top cover (Like screwed in) and the new t-5 doesnt even have a place in the cover to put this in...

First off, what is this little harness and is it important? (Im sure it is lol)