Where is the oil sending unit on a 1997 Jeep Wrangler 4 cyln?

The oil pressure sending unit on a 1997 Jeep Wrangler 4-cylinder (2.5L) is located on the passenger side of the engine block, near the oil filter. It's a relatively small unit, and you might need to get your hands a little dirty to see it clearly. It's usually a single wire connection.