help id this(coolant temp switch)and its wires to it

i have a 92 geo metro .(i thought xfi)on the left looking at the engine under the air filter is what looks to be the coolant temp switch.a item with threads showing then the nut then a copper lead off the top.BUT NOTHING IS CONNECTED TO IT AND I CANT FIND THE WIRE TO IT.chiltons is no help.i asked another site they said if im gettting 48 mpg go to the frigde and drink a beer..well i need to find this all out . did full tune up and all cylanders at 195 psi (cherry).i had thought i might have a replaced engine other than a xfi. not sure yet.http://s675.photobucket.com/albums/vv112/dags123/?action=view&current=100_0722.jpg
try this link if it JUST brings you to photo bucket look at the top of the page if it says dags123. or search,,, dags123 ... PLEASE ..clik it it should bring you to the home page its the first 3 pix as seen the air filter top right.looks like it s in the left side of the throtle body.. so i need to find the wire. and or were it ends up incase its broken off some how.. pictures will help ..i tried to upload 2 pix at less than 100 kb. but cant. thank you for your time

mine looks the same way, no wires. I was wondering if one might can hook up a temp guage to it or something. This has been asked before I think, but no answers that I know of.

That sensor is unused on models equipped without A/C