Most people on this forum whould have installed 996 gauges would probably have done so in conjunction with a 3.4 or 3.6 996 engine swap (The regular Boxster gauges won't work with the electronics necessary for the new engine). It would entail installing an oil sensor - but I've seen that written up on this or other forums.
Another issue is resetting the odometer. I don't think anyone besides a dealer can do that - and I'm not even sure that they can.
Good luck.
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