Where is the oil pressure sending unit on a ford 289?

The oil pressure sending unit on a Ford 289 is located on the engine block, near the front of the engine, and usually on the driver's side (left side). It's a relatively small unit with one or two wires connected to it. However, the exact location might vary slightly depending on the year and specific engine configuration. You'll likely find it close to where the oil filter is located. Checking a Ford 289 engine diagram specific to your year would be helpful for precise placement.