there should be a harness that came with the T5, plug that into the wire that attached to the neutral safety switch that was on the AOD.
you can also take a bolt and push that into the neutral safety switch harness underneath the car. this should ground the harness and complete the circuit allowing the engine to start.
lastly you can rig a start button by putting a button or switch inside the car and running a wire from each lead on the button to the poles on the starter relay.
all three of these will allow the car to start in gear so make sure the car is in neutral before you start it!