I have a 1990 dodge le 1500 and im trying to find the crankshaft position sensor.I even bought a book and it tells me where it is but i still cant find it.Can someone help?

 

Behind the passenger side head, on the bellhousing mating surface of the block. If you have an auto trans, its pretty much in the same neighborhood as where the tube turns to go around things..... held in by two bolts. On yours, you should be able to actually SEE it.