Does anyone know that the wire size is for the 8 pin connector for a '68 Barracuda rallye dash?
Ok, so the 18 means 18 AWG, and the 12 means 12 AWG.The wiring diagram shows 18 AWG. You can get a copy of the service manual and diagrams free at mymopar.com
But ALWAYS heed any advice offered by RedFish.
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Agreed, though I have seen wire with additional strand but making the same gauge wire with a very flexible (silicon???) insulation.The larger gages will be heavier and less flexible