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is the harness plug and play with T4R? Or do you have to splice into the OE harness?
Not sure what you're asking...It's just like adding a set of lights. So you wire it up like that. No splicing involved unless you want to do it that way. Took me 20 mins to do them on my Tacoma, and most of that time was getting through the firewall.
Piece of cake!!