Very accurate temperature. I'm not sure if the rechargable battery makes a whole lot of sense, but it is nice to know the coolant temp even when the ignition is off. The buttons are difficult to push so make sure you mount it in a location that has a strong backing. Otherwise you may crack or dent where you mount the gauge. It would make more sense if the sending unit was 1/8th npt instead of m10 x 1.0 thread. But a 1/8th npt die will fix that up quickly and easily.