All that's needed is to wire one of these into the OBD harness or the fuel pump relay:
http://www.ebay.com/itm/RFID-Key-Acc...item255e23e6da
The OBD harness/port is probably more convinient as one would only need the RFID token to activate the OBD port vs using it every time to start the car if the circuit is wired into the fuel pump/ignition.
-enjoy
