The touchscreen molded in the dash needs to go to the computer with vga and usb.
Computer is any computer. A screen does not care what form factor of a pc its vga signal came from and usb is just that, universal. (well global anyways

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So you can use a laptop, or desktop pc or anything. If you use a laptop, make sure to get one that you wont mind hacking the power button on. One that you can get a dc-dc power supply into (meaning make sure it uses a standard voltage and doesnt eat a gagillion amps). Also make sure that you can get the VGA output enabled even with the lid closed or something.