Trev,
I don't know the specific application for your shifter. A neutral starter safety switch is merely a switch in series with the START position of the key switch. It is always/only closed when the rig is in PARK. It would be two terminals or wires that only had continuity when the shifter was in PARK.
The little gear indicator lights must be selected by some internal switch when the handle is moved from one gear to another. This would probably involve two wires also...a ground and a power wire.
I don't know if the power wire for the selector would be connected to the dash lights...probably not. It seems like they should be on whenever the vehicle is running.
You would have to pick a point in the wiring that achieved this...only powered when the rig was running.
It's a long explanation for some simple wiring. A little time with a Ohmmeter and you would have it all figured out.
Stuart