Hey you all....my 88 REX SE ....when I crank it and it first starts running, the oil pressure shoots up as normal but according to the guage it drops back to zero....been driving it like that a week, not running hot, no noise or smoking...sounds like sending unit? Opinions appreciated so I can troubleshoot this ....THANKS ! !

 

hey man just buy an autometer mechanical one. sometime though you will run alittle under 25 but then psiyou will shoot up to about 1 bar under

 

The most common cause is the wire falling off the sender.