[CalifSLK]

The 12V Accessory jack is an easy place to tap the 12V and GND. It is mounted on the Under Dash Cover. The connector comes off the jack assembly sideways.

Just use those insulation displacement tap connectors (blue color). When you crimp the 12V with pliers, be careful not to touch any surrounding metal area that may be grounded. I use a small pair of channel lock pliers with insulated handles to do this job. When you remove these connectors later, it just leave small "bit' marks on the wire jacket. The one on the right is non-removable and made for smaller gage wires and for weather proof application. The one on the left is best for car interior and made for many different wire gage sizes (color coded).

The 12V Accessory jack is on a 10 or 15amp fuse. The SDAR radio likely draw less than 1amp. So you will need an inline fuse which may be in the Sirius kit.