Red/White Wire Behind Intake?

I took the wiring out of the engine bay a while back to clean everything up, and now I have a wire left that I can't figure out where it goes. It is Red with a white stripe, located in the same bundle as the oil PSI wire, with the same attachment on the end. Can someone look on there car to tell me where it goes? I just can't see ANYTHING for it to snap onto!

Thanks so much, I was wondering why I couldn't find a temp sensor anywhere!