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Your lucky we have the wiring manual for a 1990 in the FAQ, the older stuff is hard to find on PDF. Here is a snap shot, it does look like it is in the same location as the magnums.
thank you...somehow when i was looking through the 90 pdf i missed it...i think the sensor went is bad since the p.o. said the gauge never worked and i saw hat the ground strap will need to be replaced...
oil pressure sending unit
