Pressure sensor only. When standing in front of the car -facing the engine- you should see a wire snaking near the starter, down under the timing belt cover, up past the waterpump, and to the sensor screwed into the block...to the right of the power steering pump.

If you have only an idiot light, there should be one terminal to the sensor. If there is a pressure gauge (even an option on 740/760s?), there should be two wires.

Hope this helps.