Windows 8/10 would probably be OK, as Metro is pretty well set up for small screens and touch, That said, there are better options.
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All depends on how good you with computers.
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You could put Windows on it and run centrafuse for the front end.
https://www.centrafuse.com/en/
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Easy, pretty non technical, but has a bit of cost for the software.
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If you don't mind playing, you could use Tizen IVI as the front end, just dual boot
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with a boot loader so you can select that or Windows for when you want to use the ECU program.
https://www.tizen.org/about/devices/veh ... fotainment
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Probably be a bit of screwing around to get the dual boot working, but Tizen IVI is awesome!! and free.
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Pay a bit of money and you can get a really nice 3d satnav as an add
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on.
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But, unless you are pretty good with computers tizen will be a bit of a ball achche, as its very much in beta.
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Its what alot of the OEM's use and is the offical OSS part of the Automotive grade linux program.
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