Diagnostic port

OBDLINK MX, Tech2, some snap on thing.

Anything else is a fire hazard. You can use a $20 elm or whatever but do not leave it plugged in.

Bluedriver

Bafx Bluetooth for $22. And torque app.

The good stuff is expensive. And not worth the money if you don't use it enough. Like a shop for instance.

I'd like to find something that's comparable to the good stuff but nothing seems to be out there.