What year is your TM? I think most of what you need was installed as standard, even if you didn't buy the radio option.
The 12-volt feed should already be in place above the refrig. Similarly, the antenna feed should be there, assuming have the little black horizontal bar antenna on the back edge of the front shell. The speaker wiring from the radio area to the cubby near the ends of the front overhead storage area should be there, even if the speakers are not installed.
Be sure you know what you have before you start cutting and drilling and running wires.
Bill
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