The oil pressure sending unit on a 1995 Chrysler LHS 3.5L engine is located on the driver's side (left side) of the engine block, near the oil filter. It's a relatively small sensor, often with a single wire connected to it. You'll likely need to look closely and possibly use a flashlight to spot it. It's usually screwed into the engine block.
Because the exact location can vary slightly, referencing a repair manual specific to your 1995 Chrysler LHS 3.5L is highly recommended for precise placement. A diagram will be very helpful. You can find these manuals online (often as PDFs) or at auto parts stores.
