One of the reasons why temperature gauges are not provided is that they are the cause of many service bookings that the manufacturers believe are not warranted.
In many cases, there is no indication of what the actual temperature is, just that it is "normal". It all depends on the accuracy of the sender and the gauge itself. On my old Torana, GMH got a huge number of service bookings for "overheating" that were because of a wayward batch of senders, so all they did was change the specification for the sender so that the gauge indicated lower. Then they got bookings because owners felt the engine was not warming up!
It is easier to get a sender that provides one accurate reading than one that gives an accurate, progressive reading, hence some newer vehicles having just a LED or one that changes colour that is useless to those who are colour blind.
The problem with an aftermarket gauge is getting it to look reasonable. Then again, there are many who have extra gauges in pods that sit on the dashboard, or a console, or overhead.
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