Locate where you would like to install the gauge on your car.

The purple wire attaches to the Primary O2 Sensor. We will be attaching this wire at the ECU.

You will most likely need to extend this wire in order to reach the ECU.

Remove the kick panel on the passenger side by unscrewing the larger clip and pulling on the smaller clip. 

American models do not have the computer with orange plugs, as it is the ABS Computer. The ECU is behind the ABS Computer, locate and unplug the blue wire harness connector on the ECU.

The purple wire needs to be spliced into the thick white wire circled in red.

Locate a power source for the gauge with the ignition switch in the on position only. You should be able to do so with a test light or multi-meter, under the drivers side of the dash.

Attach the ground wire to a good ground source.

Test the A/F gauge and see that it works.

Re-install all panels removed.