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The headliner has provisions for wires to the windshield already.
Dash cams take around 1 to 1.5 amps when active. Radar detector, probably more. Too much current depends on how you wired it all up. If you are piggy backing on an existing circuit, you have to check it's fuse. Most would be fine though. If you are concerned though, you would need a circuit that goes directly to the battery like a fuse splitter.
Basically, if the circuit the air bag light has a fuse of 10 amps or more, then it will probably be fine.
Worst that can happen is you blow the fuse.
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