The plug is 12V power that you can use for GPS. Driving lights will require a relay and you can use that power plug for the relay. IMO, driving lights under the oil cooler is a bad idea. If you have to brake hard, it could possibly hit the fender. Best place for light is mounting them on the fork tubes.
On a GT there are no visible fork tubes. You can mount fog lights lower near the calipers but too low for driving lights. I am not against using a relay but LEDs are of a low enough draw (4.9 amps) that it is probably not needed
Sorry, I was picturing my RT in my head. I have a 1300GT and the lights are mounted on the brake calipers. I have Motolights on my bike and they require a relay. I also replaced the bulbs with LED's and left the install as is.