Kris,
The reason its different is because that's the Air Temp Sensor #1 (of two - the other is smaller and in the plenum -air box)
The head temp sensor is about the diameter of your finger, with threads on one end and the lead wire you were expecting on the other end. Take a look at
Pelican Parts Catalog for more details. It will also show location.
tempsensor#1 is in the plenum right next to temp sensor 2 which is in your picture and is apparently the mount had broken free from the plenum.. the head temp sensor is under neath the engin tine behing a hole next to spark plug#3
here is a link to what is what and what does waht and why.. boring but priceless trouble shooting guide..
http://members.rennlist.com/pbanders/djetparts.htmalso more easy info here,,
http://www.rennlist.com/techarticles/djetronicfuel.htmalso do not forget to look at google image search for 914 engine or components alot of time you will find a picture of your engine with everything in its place..
Good luck.