AEM Wideband Gauge Install

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Wideband Gauge


A wideband o2 gauge became necessary when I decided to install the AEM FIC. It provides a very fast and accurate display of the air/fuel ratio (AFR). The display allows you to keep an eye on what the AFR is under different driving conditions and can provide data directly to a logging system such as the AEM FIC. Looking over logs made during test runs can help you set the fuel map accordingly.

So I purchase an AEM 30-4100 UEGO Controller Gauge. It has a digital readout and LEDs that light up around the top. It also has data sharing capability for the FIC.

The hardest part is adding an o2 bung to the exhaust system. I chose to add one to the mid-pipe close to the engine flange end. I found and marked a location on the mid-pipe before it was removed. The o2 sensor must not be mounted inverted so it will not collect moisture that could cause it to fail.

I then drilled a hole and welded the bung into place.

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Once the mid-pipe was reinstalled, the o2 sensor was installed.

Now to the wiring and a gauge pod. I used a door pillar two gauge pod so I could also add a vacuum/boost gauge.

The door pillar trim had to be removed so the wires could be run. There are two harnesses that came with the wideband gauge kit. One goes directly to the o2 sensor and the other is for power and data. The vaccum/boost gauge only needed power and ground from the dash light circuit and a vacuum line to the same line that feeds the FIC.

The dash lights were connected at the center console onto the red/black wire since I already had it out.

The o2 harness wires had to be released from the connector so they could be fished through the firewall.

I used the same hole as the vacuum line for the FIC had been run on the passenger side.

Two holes were needed to hold the pods to the pillar post.

The gauges were installed in the pods. Then vacuum line and electrical wires connected,

Finally, the pods were mounted to the post.

Believe it or not, everything worked...even the face light dimmed with the dash lights!

Update 11/10/2014

I was having a hard time reading the digital gauge since it would change so quickly. However, it did fine for logging data.

My friend Roger suggested I try the analog gauge instead. He pointed out that the needle stays steadier longer and still had the capability of feeding the FIC for logging.

So, I purchased an AEM 30-5130 UEGO Analog Face Wideband o2 Gauge Kit.

I had no trouble installing it since the wiring harness was identical to the one I had already installed. However, I did swap the o2 sensor to be sure it was calibrated correctly. Then I installed the gauge. But, notice this time I moved the o2 gauge to the top. It was the one I wanted to see most.

Again, everything worked!