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This is simply because it's not cheaper. The screen is not just any display for phones or tablets, it is a good quality one with deep blacks and additionally it has to withstand all the tortures of car driving , like vibrations and temperature changes, for over 10 years. Which phone does that? Suppliers let the OEMs pay for that.
Then there's the other hardware. A chip with 3D rendering capability, networking, multiple kinds of memory, all with the same requirements mentioned above.
Developing the software costs quite a lot as well, even if the cost is not per piece.
It would make no sense to create analogue gauges which try to look as digital as possible, if digital ones would be cheaper and you could just use those instead.
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