Location of oil pressure sender unit 1999 ford explorer?

The oil pressure sending unit on a 1999 Ford Explorer is located on the passenger side (right side) of the engine block, near the oil filter. It's a small, usually cylindrical, unit with a single wire connected to it. However, the exact location can vary slightly depending on the engine (4.0L SOHC or 4.0L OHV). You might need to consult a repair manual specific to your engine type for a precise visual.