alright i have a 88 iroc z with a tpi 355 in it that has maybe 8k miles on it. the whole time this motor has been in there, the oil pressure gauge has always fluctuated(sp?). what i mean by that is that itll just sit there and start moving up sporadically and then go back down to its original spot that it was previously at, or itll go kind of high and stay there til i let off the gas and give it gas again and then go back down to the original spot. this has worried the hell out of me and today when the needle was on the white mark that is 15psi im guessing, which ive heard is about where it needs to be at idle when its warmed up, it started getting a little under that mark and scared the **** out of me. ive always had engine problems and i really hope its the gauge or the switch or something. please help me!!!!!!all help is appreciated. thanks guys

 

try replacing the oil pressure sending unit