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Need To Find Speed Sense Wire For 99' Gs400

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Hello , I have a question and was wondering if you could help me out . I have searched lexus club owner's forums and the entire enternet high and low and nothing . I have a 99' GS400 and I just bought a Pioneer AVIC-N1 navigation all in 1 unit . I need to know exactly where and what color the vehicle speed detection wire goes for the navigation . I already installed an SRT intake and would imagine the wire would be somewhere in that same black ECU box that i tapped the wires for the intake but i just don't know which harness or wire ??? Please help if you can . Thanks

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