Where is the computer on a 1995 Ford Thunderbird?

There is no computer in the sense of a standalone box in a 1995 Ford Thunderbird. The "computer" is the Powertrain Control Module (PCM), also sometimes referred to as the Engine Control Module (ECM). This is a computer built into the vehicle's electrical system. It's usually located somewhere under the hood, often near the firewall or in a protected area, but its exact location can vary slightly depending on the specific Thunderbird model and trim level. You'll likely find it by consulting a repair manual for that specific year and model.