Don't know about the P10 but it shouldn't be too different, considering that I used a 300zx piller pod.
What you should do it find a shop around you that sells gauge pods and find one that fits closely, but is a bit bigger. Then use a dremel to trim the pod to fit and a heat gun to make the shape fit perfectly. Take your time, not like I did, and you'll do a nice job.
I have gauge pods in my 92 p10. I used the dual gauge pod for the 89-94 240SX made by Autometer. These require no modification for the p10. I ordered mine from Summit for about $30. They come black, but you can paint them to match the interior (like I did) I will have some pics of mine very soon. I hope this is helpful.
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Jacob Barnes
extreme G20
kamilian flip flop paint
chrome SR20DE preparing for turbo
18" RO_JA Formula 5
much more....