Where is a oil sending unit located in 455 Pontiac engine?

The oil pressure sending unit on a Pontiac 455 engine is typically located on the engine block, near the oil filter. It's usually a threaded fitting, sometimes on the driver's side (left side as you face the engine), sometimes on the passenger side (right side). There isn't a single universal location; the exact placement can vary slightly depending on the year and specific configuration of the engine.

To be certain, you should:

* Consult a repair manual specific to your year and model Pontiac 455. This is the most reliable way to find the exact location.

* Visually inspect the engine block. Look near the oil filter for a threaded fitting with a single wire connected to it; this is likely the oil pressure sending unit.

Remember to always disconnect the negative battery terminal before working on any electrical components.