What is this?
 

I am posting this 'cause I don't know what this is and wanted to know what this sensor does and is it a must have.. my friend has two rx7's and neither of them have it. he'll probably see this later lol
http://i62.photobucket.com/albums/h9...d/IMG_0028.jpg
http://i62.photobucket.com/albums/h9...d/IMG_0030.jpg

I'd say it's the ass end of a RX-7. What say you?

its a water temp sensor for emissions stuff.

i only screwed it in half way cause its extremely hard and i dont wanna crack a new radiator :o