1. Open the hood of your 1994 Mustang GT.
2. Look near the passenger side of the engine bay.
3. Identify a square-shaped electronic module secured with a few bolts or brackets.
4. Check for labels indicating "ECC," "PCM," or similar abbreviations related to engine management.
5. The ECC/PCM may have wire connectors attached to its ports.
It's important to note that the exact location and appearance of the ECC/PCM may vary slightly depending on specific factors like the engine configuration and year-to-year design changes. If you're still unable to locate it or have any concerns, it's advisable to consult the owner's manual or seek assistance from a professional mechanic to ensure you identify the correct component.