[V8] Temp Sensor

[CoultL at aol.com]

I am going to buy a thermostat from the dealer and hope that helps my overheating issue.  I figured while I am throwing parts at the car why not replace the temp sensor.  As I understand it, the one on the front of the head is the g63 and this is the one that the cabin gauge reads?  I unplugged it today and the gauge went to zero...I thought it was supposed to use the signal from another sensory if the one on the front of the head was unplugged.  Does my needle going to zero when I unplugged signal that this other sensor is toast?  Thanks in advance.

-Justin Lewis