Just a little tip when installing your air fuel gauge, This install means you have to tap into the bleu signal wire. make sure you sauder the wires together.

You will have four wires,

2 Black-ground
1 White- Heater wire
1 Blue-Signal Wire

If you tap the wrong wires you will damage your o2 sensor.

 

two black wires are no both ground!!

one black is 12 volt one black is ground white is ground blue is sensor

use the two black wires for ground white wire for ground and blue for sensor good luck

or thats how it is for the primary o2 sensor that screws into the o2 houseing by the turbo in the front of the car.