I use an Ultragauge from
http://www.ultra-gauge.com/ultragauge/index.htm. It suction cups to you window and gives you realtime data reading along with diagnostic codes and cose clearing. My Versa has only a speedometer, with the Ultragauge I am able to read most of the sensors that the ECM is listening to, all day long too as I drive along. It's the best deal I have found for general car owner scan gear.