DPDT relay. Center connections going to the PCM. NC connections going to the connector in the steering column. NO connections going to a resistor (or combination of resistors) that matches the resistor in your key.
Connect the relay coil to the ignition disable output on the starter. [Strongly] consider adding a diode across the coil to protect the starter outputs (1N4001 - 1N4007 family would do).
98' Trans Am - SLP lid, Umi Sway Bars...more to happen when money allows. Tuition is killer.