choke wire

Ballast resistor(red wire). The wiring stays under hood.
Where can I tap in the choke wire under the dash. I was thinking to splice it in the cig.lighter wire but can both work at the same time. Or would splicing into the radio wire .... was worried it may cause static in the radio or noise. Any other suggestions would be great as long as it connects under the dash since that is where the wire is run to.

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