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I don't have the tubing running in front of my rad but I do have to plug under the dash for the brake controller and the harness for it (stock with the truck from the dealer when I bought it)
It was listed on my window sticker after the tow package, Wonder if it was seperate from it? (seperate listing that is) Did you also get the plug for it? was in the glove box. I have that also. Do you have the tow package?