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I had this happen after having the HPOP out as well, although it didnt show up for a couple days afterward. I had the oil cooler out as well to replace the HPOP inlet screen. I must have damaged the oil pressure switch somehow while handling everything. Shortly after the low oil pressure warning came up it started leaking oil past the connector at a fairly serious rate. Might be your problem, might not.
Edit: After re-reading your original post, I think you are confused as to what the oil pressure gauge on the dash is reading. It has nothing to do with the high pressure oil system, and the low pressure system which it does moniter (although only as an idiot light with a needle) shouldnt need any significant amount of time to prime.
'05 F-350 Crew cab XLT 4X4
EGR and cat deleted, Insight CS, Sinister coolant filter, complete update kit.
Last edited by Haze; 07-06-2011 at 07:44 PM.
Reason: Re-read OP