Will this sensor work with my factory ECU without reprogramming?

Yes. This sensor is designed to OEM specifications and reads the same parameters as the original unit. Your factory ECU recognizes it immediately with zero tuning needed.

What tools do I need to swap this in?

Basic hand tools and a socket wrench set are sufficient. The sensor connects to the factory harness and mounting bracket — no cutting or adapting required. Disconnect the battery before starting.

Does this come with a new gasket or O-ring?

The sensor unit itself is included. Check your OEM gasket kit or service manual to confirm whether a fresh seal is recommended for your specific engine configuration — most installs benefit from one.