80 series high oil preasure

Joined: 06 May 2008 Location: Brisbane Australia

i have a 1993 80 series, its the 4.5l 1fz-fe motor in it. the gague is telling me its high when i first turn it on, abut drive for a bout 30 mins and it says its normal. i have replaced the preasure relif valve at the oil pump but that didnt seam to much. im thinking maybe the swich sender or maybe the gague on the dash? any thoughts? oh and i dont know how long its been doing it for because i only bought it 3 weeks ago.....