oil sensor& tighet gas pedle cable

any1 know where the oil sisor is on my 91 sunbird 2.0l OHC? ive been meening to look at it casue of the idle problem and now im leaking oil. one thing is when in front under the car i see a hole that looks like it had a screw it it i try get some pictures(how do i put pics in forum) one thing i wanted to do this week was to tighten the gas padle. any1 know how to do this and how?:iceslolan