I have a 2006 Landcruiser and purchased the Engine Guard primarily to monitor the auto transmission temperatures accurately. The two sensors monitor the engine head temp and the auto temp. Easy to install. I was surprised how reactive the sensors are when they are just bolted on the outer housing. My normal auto temp is normally 65-70degrees but went up to 90 doing hard sand driving. Temperature is the no.1 killer of autos as it degrades the oil, stopping lubrication. Great product providing peace of mind for just over $100. You get to set when the alarm goes off. Also the staff there were very helpful. BTW the sensors can monitor anywhere.