Torque OBD 2 engine diagnostics
 

Anybody have one of these ?

Torque OBD 2 engine diagnostics — Torque

I was thinking of getting one for my GMC truck to monitor transmission
temperature while towing.

Not tried that one but I have Dashcommand on my iphone and an OBD wifi transmitter.

Yep, have Torque Pro with an older ScanTool BlueTooth OBDII cable.
Never tried it on the Boxster, but use it all the time on our Saabs.
Works fine. Resets the check engine light when a sensor screws up once in a while and I can tell the Indie what's wrong with our cars when I bring them in.

I have recently installed Parrot Asteroid Smart into my Boxster, and on it, Torque Pro. It works well with a cheap eBay bluetooth OBD2 scanner.