Were is the oil sending unit on a Dodge Ram 2003 1500 4.7 L?

The oil sending unit on a 2003 Dodge Ram 1500 with a 4.7L engine is located on the bottom of the oil pan. It's typically a small, threaded sensor near the driver's side (though it could be slightly offset depending on the exact configuration). You'll likely need to get under the truck to see it. It's important to be careful when working underneath. Consult a repair manual or online diagrams for your specific vehicle to be sure of its precise location.