I've been using a wifi OBD device, the Vgate iCar ELM327 from these guys:
http://www.obdinnovations.com/vgate-ica ... s-scanner/
Works fine with my iPhone and DashCommand. I bought the Ford PIDs (extra $10), but that gave me transmission temp, which wasn't otherwise included. You can also custom program that into a Scan Gauge.
It's pretty nice, but will really chew battery power so your phone has to be plugged in. The OBD has auto-off, which is nice, but to restart it I have to plug it back in. Maybe that's unique to the Ford OBD port; I dunno. Unlike some others you just log into its wifi network; some others require you set up a static IP address on your phone which can be a pain.
Also, I'm looking for a better OBD app. Dashcommand is nice, but the custom gauges are all round dials. I'd like something that just puts out big text; I don't even need the labels. I have to mount my phone a bit away from me so those little dials are hard to read.
And I haven't yet found an app that does a real good job of emphasizing the sort of stuff we're into; most lean towards performance tuning, although DashCommand does have a tilt meter for offroaders. I'd like more odometer functions combined with tilt and GPS data (kind of a Harry's Lap Timer for 4x4s). That with temps, RPM, and fuel stuff. Anyone know of anything?