Wow second time in one day that someone asks the same question, go figure. Here is the picture:

Item 6 is the coolant
tcc temp sensor that if disconnected gives you 20 seconds of glow plug on as the ECM thinks it is really cold.
Oh words next to the picture would be:
6 - Engine Coolant Temperature (ECT) Sensor -G62-
Color: blue
For engine control module
with Engine Coolant Temperature (ECT)Sensor -G2-
Before removing release pressure if necessary