Used coolant temperature sensor.  This sensor is for the gauge cluster (1-wire), and mounts in the cylinder head.  Fits the following:

92-96 LT1/LT4 Corvette
93-97 LT1 V8 Camaro
93-97 LT1 V8 Firebird/Trans Am

NOTE : This sensor is a single wire (green) for the gauge cluster water temperature gauge!  This is not the sensor for the PCM (2-wire).  Be sure you are ordering the correct sensor!