Not sure if thats a service reminder?
1N5P-1 = INSP-01 as posted in the linky
The services reminders are "IN 01" etc though, there is no s or p in there unless i am missing something?
Is it only when you turn the ignition for the first couple of seconds?
Yes if you changed the clocks it probly retained the timer from the car previous for the intervals if that is whats flashing. It shouldnt however make your oil light flash (unles it is on ignition!)