What might prevent a 97 Eagle Talon from shifting into gear after replacing the wiring harness and steering column?

If the trans. is an automatic, the prob. might be in the trans. shift interlock solenoid. This is a solenoid that prevents shifting into gear unless your foot is on the brake pedal. The solenoid is located on the steering column or under the center console on floor shift models. Check to see if you have any connectors unplugged at these locations, if you do, find where it goes and your problem may go away.