I got the heads back today from getting ported out. I was looking them over and on the driver side head, there is a sensor that goes into it. Well it broke (i'm guessing during shipping). Does anyone know off the top of their head what sensor that is and where/how much I can get one for?

 

Coolant temperature sensor, $11 at Autozone. Don't let them get it confused with the other coolant temp sensor in the water pump housing, you want the one with one vertical and one horizontal pin.

 

A/C Delco #213-77

GM P/N 25037332

commonly called a temperature gauge sender to avoid confusion with the ECT sensor

 

I agree with to that is exactly what is. like stated make sure you get the one for the gauge. not the one for the computer that is in the water pump