im pretty sure that all GTRs had the G senor, not so sure about the lap sensor.
one thing to mention with all skylines, especially the GTRs is to make sure u keep your Xenon HID bulbs in the car, although compliance requires these to be removed, make absolute sure ur compliance company puts them back in. the mistake i made we i purchased mine was i didnt no anything about skylines. and so im left with shockn aftermarket HIDs which willl never be as good as the factory Xenons.
thats my advice