Where is the oil pressure light switch on a 1999 Chrysler town and country van with 3.8 l engine?

The oil pressure sending unit (often mistaken for a switch, as it performs a similar function) on a 1999 Chrysler Town & Country with a 3.8L engine is located on the driver's side of the engine block, near the oil filter. It's a single-wire sensor, usually a small cylindrical unit. You'll likely need to look closely and perhaps use a flashlight to locate it. It's not always easily accessible; you might need to remove some components for better access.