Hi Hugo. New to the forum here. I just installed the E7019 head unit in my 07 FJ. I have the GPS antenna, but am confused about tapping the vss wire. I've read your posts as well as many others. Do I need a special harness to make this work? I had the FJammer radio as my original if that makes a difference. As it is right now, when driving, the GPS shows me at my home address no matter where I go. Please, I beg you. I need help! Thank you.