Well I FINALLY got the missing piece to permanently attach the SiriusXM radio. I needed a 5v inline inverter. Here it is:
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The switch is soldered to the 2 data bus wires from the cassette connector and allows me to easily go from FM to SiriusXM. I took the 14v and ground off the cassette connecter for the inverter so turning the radio on/off also controls the power to the unit. I bolted the bracket to the dash, so I won't have to worry about the foam tape cutting loose. I also snaked the antenna wire under the headliner so it is mounted to the roof @ the passenger side rear between the roof rack and hatch glass.
