2011 LS 460 sport.
Looking for the best way to run a wire from the engine compartment to under the dash for a remote radar detector. Whistler pro 3600.

Anybody run any wires for any type of accessory like this. Hate to drill a hole thru the fire wall.
In the past with other cars could always find a rubber bushing knockout plug I could use.

Thanks for any suggestions

 

The main wire loom comes thru a grommet from under the batter. You have to remove the battery and possibly the battery tray to be able to access it. I ran my 1/0 gauge wire thru this same entry.