I got this little OBD2 reader with live data stream. Took a chance, only $60. That's what, a tank of gas?
Anywho, it's built fairly solid. It's wired, and so far not causing issues with the car. I got it for coolant temp and charging system monitoring for upcoming 2000 mile road trip, but it has a ton of options. I know one other on here has tried it, too. Will give a full review once I've had more time with it.