The coolant temperature sending unit on a 1995 Chevy Camaro Z28 is located on the passenger side of the engine, on the cylinder head. It's usually a single-wire sensor, and it's relatively small. However, there might be *two* sensors; one for the gauge and another for the computer (ECM). They're both typically in the same general area.
To be certain, you should consult a repair manual specific to your 1995 Camaro Z28's engine (likely a LT1). A visual inspection with the engine bay clean and diagrams from a repair manual are your best bet for positive identification. The repair manual will show you exactly where each sensor is located.
