I went to drive my 89 manche 4.0 5-speed this morning and teh oil preasure was sky high. at idle it was sitting at teh 3/4 mark and at 3000 rpm the guage was maxxed. I changed nothing between last night and this morning and I need to take a 60 mile highway trip later today. What are teh possible culprits of this? CPS? Computer? HELP!!!!!