To find it, you'll need to:
1. Consult a repair manual: A Chilton's or Haynes repair manual specific to your 1994 Chevrolet S10 will have diagrams showing the exact location of the CKP sensor for your particular engine. This is the most reliable method.
2. Look near the crankshaft pulley: This is the large pulley on the front of the crankshaft. The sensor will be relatively close, often mounted to the engine block facing the pulley. It's usually a small, cylindrical sensor with a single wire connector.
3. Visual inspection: Once you've located the crankshaft pulley, carefully examine the surrounding area of the engine block. Look for a sensor that fits the description mentioned above. Be mindful of hot engine components and take necessary safety precautions.
Important Note: If you're not comfortable working on your vehicle, it's best to take it to a qualified mechanic to have the sensor located and replaced. Mislocating or damaging other components during the process can be costly.