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Hi Mark,
You don't need to hook up either the white or the brown wires. The car will run open loop and be OK. You can watch the air fuel ratio on your new gauge. If you want to feed a simulated narrow band signal to your car's brain so it can try to adjust its mixture, just connect the white wire to the place where you disconnected your old O2 sensor. You can watch how it controls air and fuel. I have no experience with data logging, but I think the brown wire provides a ground for that purpose only.
Good luck,
Dave
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Dave McKenzie
1984 Carrera 3.2
1984 928S Automatic
2001 996TT
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