You can tap into power and ground at the BCM connectors. (the BCM is the box under the steering column with a bunch of connectors going into it)
On the light blue BCM connector, find pin A4. Its a pink wire. You can tap into that for +12v ignition power.
On the brown BCM connector, find pin B6. Its a black/white-stripe wire. You can tap into that for ground.
Ben