Im getting close to finishing to being finished and cant figure out where this last single blue connector goes. Any Ideas?

 

Oh yeah, its on an 87' 4Runner, 22re, 5 spd

 

Directly to the right of the cold start injector about 2" and down about 2", there is a temp sensor with a male spade on it. Plug it in.

 

I agree with angrybob, looks like the coolant temp sending unit wire. If you already have one plugged into the coolant temp sender, make sure it isn't the one for the oil pressure sending unit - same type of connector. The coolant temp sensor has a wire color of yellow with a green stripe. The oil sending unit has yellow with a black stripe
It is possible that this blue one is not used.

 

Here is a copy of the diagram - hope it helps!

 

Yup... thats what it was, the PO had installed an aftermarket temp gauge and sending unit so thats why I had no home for the wire. Thanks for the help though Angrybob and Datsayota!!!