In my '66 I put it through (and a bunch others) the rubber grommet that feeds the A.C. hoses in through the fire wall. Probably doesn't apply to a '69 Mach 1 though. Must be other grommets through the fire wall. Make an extra hole as stated above.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.1 mph
1/4 mi.
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