I guess I'm in better shape because I'm just old and slow.
The cover that gets removed is the gray plastic "clamshell" cover that surrounds the ignition switch and the steering column. Don't mess with the actual steering wheel cover (where the horn switch is) because the air bag is in there too.
Attaching to the described purple wire will allow the fog lights to operate any time, regardless of any other switch position. Just remember to turn them off.

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