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Dezoris.. I am also running a Nexus 7 with Bluetooth ELM 327 setup. Yours looks very nice but something that really helped me was an anti glare screen protector. It really works well in the car for daytime driving and also reduces smudges from fingerprints ten fold.
Your car is really coming together nicely. After your first video you posted I wasn't real sure if you would keep or sell the car.