To be certain, you should:
* Consult a repair manual: A Haynes or Chilton repair manual specific to your 1993 Ford F-150 will have diagrams showing the exact location.
* Look at online diagrams: Several websites offer free diagrams of engine components for various vehicle years and models. Search for "1993 Ford F-150 5.8L engine diagram."
* Visually inspect your engine: Once you have a general idea of where it *should* be, carefully look around the oil filter area on the driver's side of the engine. The sending unit is usually easily visible.
Remember to be cautious when working around hot engine components. Allow the engine to cool completely before attempting any inspection or repair.