Where is the crank sensor on 89 cutlass ciera?

if engine is 2.8 or 3.1 its on the back side of engine. The only way to see it is from under the car there's a little 4 inch gap between engine and the exhaust manifold. Its up in there. If engine is bigger its near crank shaft pully and harmonic balancer. you may need to remove them to get at it.