Where is the oil pressure sending unit on a 1994 ford F350 7.3 liter power stroke?

The oil pressure sending unit on a 1994 Ford F350 7.3L Power Stroke is located on the driver's side (left side) of the engine block, near the front. It's a relatively small unit and will have a single wire connected to it. It's often near the oil filter, but not directly on it. You'll likely need to look closely to find it. A diagram or a picture specific to that engine would be helpful for precise location.