I'm replacing my head gasket and broke this sensor. Some sort of coolant sensor. Line goes from back of carb to the sensor that is mounted underneath the intake manifold. It then hooks to an green and yellow wire that goes to the main harness.

 

I have a pic of it but don't know how to attach it

 

It's coolant for sure and orilliys didn't show anything

 

Here are pics of the sensor

 

Looks like the thermo valve, part #10 in the diagram: