Where is the oil sending unit 305 engine Chevrolet 1986 pickup?

On a 1986 Chevrolet 305 pickup truck, the oil pressure sending unit is typically located on the driver's side (left side) of the engine block, near the distributor. It's a relatively small unit with one or two wires connected to it. However, the exact location can vary slightly depending on the specific engine configuration. You'll likely need to visually inspect the engine to locate it. Look for a small sensor with a single wire (for a gauge) or two wires (for a gauge and warning light).