Crank Position Sensor Location

I need to know the location of the CPS on a 2.2 91 Chev Cavalier?

Is it hard to get off and what tools do I need?

Thanks............

Center back side of the motor. Directly under the oil sending unit. One small bolt, then pry it out. Easy to do with the head off, with the head on (almost) impossible. I have done it both ways, Pull the intake and change everything back there so you don't need to do it again. Good Luck.