speedometer/odometer problem

heres the problem, my speedometer and odometer just stopped working all at once one day and was wondering if anyone knows how to correctly install the speed sensor and the piece that goes under the sensor in the tranny. Or maybe this isnt the only problem and someone can tell me what is. My car is a 95 rs and not being able to see how fast I'm going is freaking me out.
Any help is greatly appreciated. Thanks!!!!!!!!!!!