Basically the temperature gauge is not a very helpful gauge with the stock settings. The middle "buffer" zone for the stock setting goes from 75-115C (167-239F) which is a huge range. Our cars normally idle/ride under minimal engine load at around 95C, but that stock buffer zone means the needle will stay dead center +/- 20C. Many people prefer a more narrow "buffer" zone, such as 90-100C, which could be considered more sensitive/useful, or so they can react more quickly to abnormal temperature changes. An example is if the car begins to overheat and they need to turn the car off, the more sensitive gauge means the driver could see the problem earlier and minimize the risk of damage to the engine.