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If you want to just plug something in without fuss, the scan gauge would probably be the best bet. If you are the type that likes customization and enjoy fiddling around, I would recommend that you check out what what some apps like torque pro can do. A decent obd2 reader with a $50 dedicated fire tablet would give you almost unlimited options for a similar priced setup, but you better do some research first to keep from wasting money.
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