Started reverse-engineering the "accessory meter" (above the navigation screen)...
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To something more "up-to-date" that can display multiple metrics at once, using five OLED screens and an Arduino microcontroller.
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Ill buy one!
Still very very much a work in progress... I have 20+ years of experience in software, but hardware is pretty new to me.
The next work item is figuring out how the OEM accessory meter is calculating MPG (and thereby "range"). The speedometer is feeding the VSS on pin 11, but I'm still trying to find what I assume would be the MAF signal (or it's possibly getting pulled via CAN or serial).