Megatrack, to answer the question about the temp sensor; yes it is a 4-prong, but it has two sensors. Each sensor uses opposing pins (sensor 1 uses Home plate and 2nd base, sensor two uses 1st and 3d base). So, you can rotate the plug any way and not have a problem.
To check the sensors, probe the two opposing pins (home and 2nd) and you should get approx 2500ohm at 20 degrees C, 300ohm at 80C. Then probe 1st and 3rd looking for similar readings.

DG