I have a '98. Adding some fog lights and a light bar. Any suggestions on best place to bring wires thru the firewall to the switches in the cab? I have yet to see any good holes to run the wires through

 

Parking brake cable grommet often has room

Just a heads up in general, you only need 1 wire per switch, a ground wire to activate the device's Relay, the cab metal is already grounded so you just need cab ground wire to switch and ground wire thru firewall to Relay
You can also put a light in series on the relay ground wire and it will light up when switch is "on"
And you can use smaller gauge wire, relays draw less than 1/2 amp