On a 1999 Dodge Grand Caravan with a 3.3L V6 engine, the oil pressure sending unit is typically located on the driver's side (left side) of the engine block, near the oil filter. It's a relatively small unit with one or two wires connected to it. You might need to look closely and possibly use a flashlight to spot it. It's usually a one-wire unit (for the gauge) but sometimes has a second wire for a warning light.
However, be aware: The exact location can vary slightly depending on the specific engine configuration and any aftermarket modifications. It's always best to consult a repair manual specific to your 1999 Dodge Grand Caravan 3.3L V6 for a precise diagram and location. These manuals often have detailed photos and diagrams showing component locations.
