Exactly!
For some reason, with Arduino, most people just put all their code into one .ino file and that's it. This is definitely not the way I want to go for this project. I want everything to be organized and each module into their own .cpp file. In the end, it will probably require a bit more RAM and flash to do it this way (and maybe that's why people don't use OOP as much with Arduino ?) but the code is going to be soooo much cleaner.
Here is what I have in mind:
ECU comms (choose one)
- ALDL 8192 baud
- ALDL 160 baud
- MegaSquirt Serial
- MegaSquirt CAN
- OBD 2
Display pages (choose 0 or more):
- ECU monitoring pages (can be enabled as many time as wanted)
- 0-60 time
- Quarter mile time
- SD card info (if SD card data logging enabled)
- Weather (Temperature/Humidity/Altitude)
- G-force and compass
- GPS data
Optional modules (choose 0 or more):
- SD card data logging
- RTC (to properly name data logs files)
- Data logging trigger (if data logging enabled)
- Alarms (w/ buzzer)
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. I bought more stuff tonight, and I think I'm at about 500$ into this already 
Of course I will end up with A LOT of spare parts after I'm done but still a bit crazy. I just bought a Due, I want to use the Mega but I might give the Due a try at some point. In the end, it's cheaper then the Mega (doesn't matter for me now that I've bought both :P) and it has more hardware then this project will ever need (I hope).
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