hey guys.. quick ???

[FuLL BLown STD]

My friend got a 03 gti turbo.. and recently bought a air/fuel guage, and he says there is 2 02 sensors.... so what im curious of is to which one do i hook the guage up too and which wires do i tap into? im not too familiar with vw's but outta curiosity is it easy to go straight to the ecu and do it that way or is it gonna be a bitch? i wanna help him do a nice clean wiring job so w.e would make for a nice clean install. ur help is appreciated

[veedubmechanic]

Go to the front o2 sensor. I believe its the white wire, i'm not sure. also be sure to keep the wire away from the cat using the factory mounting points for the o2 sensor wires because they can start on fire if laid on the cat.