iPhone / Smartphone Car Computer Accessory and App

Once we all have our wireless keypad and everyone's iPhone is in some type of mount in the vehicle, why not also display your vehicle's diagnostics as well? All you would need is a diagnostic computer plugged into your vehicle that would transmit signals via bluetooth to your iPhone! Now you can see everything just like the fancy cars...current mpg, manifold pressure, battery strength, fuel, engine temperature, oil temperature, water temperature, outside temperature, transmission temp, alternator output, etc. You name it and you can have it! This could be especially helpful for someone pulling a camper, trailer, or anything really that pushes the vehicle close to its limits!