The T1's have a separate tail light wire harness that plugs into the chassis harness so you can replace the tail light harness if you hack it up. You just need to find the turn signal wire on that harness on each side and cut the wire. Then run that as the positive to your amber lights and run a ground to the chassis or tap into the ground from the tail light harness. I just installed an LED tail gate bar that has red running and brake lights, white backup and amber flowing turn signals. It's hidden enough to not detract from the truck but shows up when the lights are turned on. It has a flat 4 trailer plug on it. Because the T1's don't turn on the trailer lights unless a trailer is plugged in, I used a Putco Blade wire harness that plugs between the left and right tail lights at the chassis plug on each side. It gives you a flat 4 with a separate wire for reverse. The Putco harness was about $60 on ebay. The Putco Blade light is several hundred dollars and has the options with amber lights. I'm cheap and found a light bar that is mounted on an aluminum bar and has chevron shaped lights which I thought was different. The light bar I bought cost me $68 shipped off ebay.