Just find any wire in the engine compartment wiring harness that has +12V when the ignition switch is on, and no voltage when it's off and splice into it. Alternately, you can find an open terminal in the fuseblock that also goes live with the ignition switch and run the wire from there.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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