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Do this:
http://www.timetriallingforum.co.uk/index.php?/topic/124605-52t-use-track-chainring/Unless you need the low Q factor...
pifko-
The USE chainring means you can use road cranks on a track bike, but it doesn't solve the problem of the auto-zeroing giving bad calibration results on a fixed gear bike. You need some way to turn off the auto-zeroing, which AFAIK was the only difference between the normal P2M spider and the track one - the track one had auto-zeroing disabled, which you can't do with the normal one.
These days I believe it's SRM or nothing for track crank-based PMs.
Brommers
On that note - what track crank-based power meter?
I understand that p2m don't do them any more.