1996 Oldsmobile Achieva Camshaft and Crankshaft Sensors

1996 Oldsmobile Achieva 4 cyl Automatic 88330 miles

I need to replace the camshaft sensor and crankshaft sensor in my vehicle. Unfortunately I am unable to locate either ones exact location so that I am able to do so. If someone could tell me where they are located on the "block" and tell me how to replace them I would greatly appreciate it. A Diagram of the engine would help a lot also because I am unable to find one on the internet.