This is where the Transmission switch is on your column. There are 2 plugs each with 2 wires, one for park/neutral and ones for reversing lights, these both need to be extended to the new shifter.
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This is how the Park/Neutral switch is wired, it gets power from the ECU and earths when in Park or Neutral. You just need to extend these to the micro-switch on the new shifter.
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This is the reversing light switch, it gets power from the fuse box (blue wire) and sends it to the reverse lights (green wire)
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To set up a park/neutral safety switch you need to cut into the purple wire from the ignition switch and insert a small "Normally Open" relay that will be powered by this same purple wire and be earthed by the park/neutral switch on your shifter. When you turn the key to ignition, the purple wire will power the relay and the starter wire but will not let it through to the starter solenoid unless the shifter switch has earthed the relay to close the points.
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I hope this helps.