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I just recently bought the fan switch wiring kit from Mid America. What's the best way to route the wires through the fire wall and to the fan relays?.
I drilled a hole in the firewall above the gas pedal and ran the wires from the fan relays through the harness along the drivers side wheel well.
I ended up mounting the switch on the console trim plate below the radio for a "stock" look. If my memory serves me correctly, I tied into one of the small pink/black wires immediately before the relays (switched power).
You can route it along the hood opening cable housings, through the firewall. Use a stiff wire from the engine compartment, tape the ends of the wire through it and just pull it through. From there, you can figure out the best positioning and routing to the fan relays.