I wasnt sure if I should post this in electronics or tech but I'll try both.

I just bought a 5.7 350 TPI Iroc and havent ever worked on this engine so I'm still unfamiliar with it, but as I was looking around to get to know it, I found this plug unplugged from somewhere. The thing is that I dont know where it plugs into. I spent a good 2 hours with my cousin looking around to where it goes but couldnt find anything so I'm hoping someone else knows. Sorry if the pictures came out too blurry.

 

does your oil pressure guage work? it might be the oil pressure sending unit plug