UltraGauges finally back in stock - plan to velcro it to the left of the steering wheel near the instrument panel light control dial.
There was a user here who provided best guesses for Prius C custom PIDs for Torque, but he hasn't posted there lately: Prius C Custom PIDs | PriusChat Edit: I bought the app, added the custom PIDs and offered to test, but he hasn't responded to that thread. A few of them are kinda screwy, but many seem to work.