Where is the oil pressure sending unit on a 1992 jeep wrangler 4.0 L?

The oil pressure sending unit on a 1992 Jeep Wrangler 4.0L is located on the passenger side of the engine block, near the front of the engine. It's a relatively small unit with one or two wires connected to it. You'll likely need to look closely, as it can be somewhat hidden depending on the accessories and hoses in the area.