temp gauge not working

like title states, does anyone know why my temp gauge on my gauge cluster wont work?

Electrical issue or bad sender.

Check to see if the sensor is in spec. if not, well there you go. if so check to make sure its pluged in.

my sensor seems to be ok how do i check the electrical issues?

does anyone know wheres the Engine Coolant Temperature Sending Unit is?

mine gets stuck from time to time.

i just gently tap the dash until it frees.

The sending unit is in the t-stat housing IIRC.

the single prong sensor