There is a white electical connector at the end of the black plastic wire bundler (do those things have names?) that the oxygen sensor wire comes out of (they are in the same "wire bundler").

What does the white connector go to?

Note: This should be my last "Where do _____ go?" post for a while as I should be driving the car for the first time in 7 1/2 months tonight!!

 

Could it slide onto the temp sensor on the head? I think it might be what you're talking about.

 

Brake proportioning valve connector?

 

There isn't nearly enough wire outside of the "bundler" (see above post) for it to go all the way up to the cylinder head.

I'll check that out, but I'm not too optimistic. It's not a weather pack connector, it's box-shaped and tapers in width--sort of like a wide, fairly flat popsicle. I'm not completely sure that it was hooked up to anything, to tell the truth.