You don't need a new head unit but if you dont know how to wire everything up you should probably take it to someone who does. You'll need to splice into the speaker wires to get your signal back to your amp. If you do want to dive into it yourself I'd suggest getting a
Convertor It's is a rather easy task when you know what your getting into but at the same time it doesn't take much to blow an amp or speaker with one wrong connection.
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-Gavin
2006 4x4 Sport ~ Dark Khaki
2.5" Rockfather II
Tow Hooks ~ HH Rear Hitch
Hella 500's
gwip Design