Meet the Kiwi 3: a nifty little tool that lets you use your smartphone, tablet, or smartwatch as an engine diagnostic tool. It connects to the onboard diagnostic port on your car and retrieves information to transmit to your smartphone, tablet, or PC. It lets you monitor MPG, engine trouble codes, fuel efficiency, and driving behavior.
The companion app can report engine load, fuel pressure, vehicle speed, pressure, voltage, and other data. The device will be smartwatch friendly as well. You can find out more about it on Kickstarter.