my $.02... I left the original wonderbar radio in the dash, inoperable, and use an underdash unit feeding the original dash and rear seat speakers, then I ran a wire from the original wonderbar radio panel light into the dashlights wiring harness so the radio light comes on, even though the radio is not hooked up.. i also upgraded from the 10cd changer to the usb thumb drive receiver, got tired of the cds skipping..