polobai

I am trying to hook up my Alpine NVE-N872A navigation unit in my LS, but I need to know where the speed signal wire is on my car (97 LS400 coach edition). I know the ECU is behind the glove box, but I am not sure which wire to tap. I know these cars have a couple speed sensors, but I cant find which wire goes to the ECU. I have searched and searched, the closest I have come is the diagram on Lextreme...but its not too clear. Anyone have any input?