91' R32 RB26DETT: My stock oil pressure gauge has a mind of its own. Sometimes she reads normal but several times thoughout a trip the gauge tanks too almost nothing. Then bounces right back up. If I keep the RPM's around 3k the oil reads about 2bar. I have heard of the R32's having bad oil sending units, but I have also heard of the 98-91's having poor oil pumps. Sometimes when I shut the car off and turn it back on its back to normal. I never had this problem till the weather started getting cold. I'm also thinking of switching from the Royal Purple Synthetic oil back to a heavier oil. I thought if I thicken it up it might help me out. Anyways...has anyone else run across this problem yet?