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Haha sorry man it's been 2 years or more since I did that install and I can't remember much of last week.
I can tell you tho that if you are experienced with electronics, you should be fine as long as you are armed with a soldering iron and the electrical manual for your car.
You can't fail if you follow the schematics and solder EVERYTHING.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.