97 7.3L long crank time

[yellowtruck]

Hi,
New to posting here but has been very informative site for me. Working on a 97 f-350 7.3L which takes about 30 or more seconds to crank before starting. When started runs/drives fine. Delayed hot or cold. A gauge on hi pres port on head reads zero for quite a while then shoots up to over 1000# starting immediately. idles around 600 # going much higher with throttle . Resivoir stays full to top when off. Heads hold a low pressure for awhile after shutting off. Seems like ICP not getting signal for full starting pressure immediately. Just recently ford repaced cam sensor for recall although was staring fine before and after this. Had several cam sensors in past. Could a bad cam sensor cause the computer to delay oil pressure on start up if it were generating a weak or erratic signal? Problem didn't develop over time. Happened immediately. Using a 0-150 gauge shows zero for same time period. Not even a few #'s which leads me to think its not an internal leakage problem. Any thoughts would be appriciated. No lite and no codes.
Jay-

[Twinjracing]

It could be a bad IPR I've that kind of what they do.