I'm using an inexpensive universal GPS mount for mine also. So far I have auto on and off using power management in Torque and on the N7 without using Tasker. Seems to work just fine. Also using OBDLink MX for Bluetooth dongle so it's not necessary to unplug on power down. All playing nicely together for several weeks now in every day driving.
I'd like it if I could get some additional readings ... Like oil temp, tranny temp, gear selected, exhaust gas temp but it's great to have the amount of gauges that are available. I would have settled for just the boost gauge so everything else is like a bonus. I love the Torque app!