AEM 30-4100 UEGO Controller Gauge

by AEM

Product Features

• Ideal AFR monitoring tool for EFI and carbureted applications, and engine dynamometers
• Does not oscillate AFR reading like narrow band sensors
• Reads in AFR or Lambda via a switch in back of gauge housing
• 24 Color-coded LED display lights provide immediate reference to engine?s air/fuel ratio (AFR) or Lambda ratio
• Included bezels and face plates allow you to personalize the look of your gauge

Product Details

• Item Weight: 3 pounds
• Shipping Weight: 1.4 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000CFQM4G
• Item model number: 30-4100
• Average Customer Review: 4.2 out of 5 stars  See all reviews (5 customer reviews)
• Amazon Best Sellers Rank: #9,474 in Automotive (See Top 100 in Automotive)
  • #14 in Automotive > Performance Parts & Accessories > Ignition & Electrical > Engine Computers
  • #15 in Automotive > Replacement Parts > Ignition Parts > Engine Computers

Product Description

A wideband UEGO sensor controller accurately monitors Air/Fuel ratios (AFR) during the tuning process to prevent a lean fuel mixture, which could lead to engine damage. AEM has combined its single-channel wideband UEGO controller and gauge display into one unit, uniting unsurpassed AFR accuracy and control with an easy-to-read interface. AEM’s Gauge-Type Wideband UEGO Controller features a digital LED display and sweeping LED “needle” that changes colors as AFR changes from rich to lean. The unit’s 52mm (2-1/16”) gauge housing fits in most gauge pods and can be remotely mounted virtually anywhere.

Customer Reviews

Most Helpful Customer Reviews

3 of 3 people found the following review helpful:

4.0 out of 5 stars Great product , fast shipping and easy installation, May 4, 2010

By 

Alex Bond - See all my reviews

Amazon Verified Purchase

This review is from: AEM 30-4100 UEGO Controller Gauge (Misc.)

AEM 30-4100 UEGO was very easy to install. I had it up and running in no time and also made a RS232 wire as well as a Firewire IEEE 1394 (male to male) for dataloging. The RS232 was connected to a Hyper Terminal program found in Windows Xp(Only optional and was used to double check my formula in Live Link..I did not datalog by using both cable at the same time) . The IEEE 1394 cable was connected to a Xcal3 from SCT and used with Live Link to datalog more efficient. I hooked up the 12v cable for the gauge on a 12v ignition only wire on the car and a ground under the dash. Simple as that. Also has lights integrated in the 12v and ground circuit so you don't have to mess with also hooking up the lights as in other gauges. Only downside is the Bosch O2 sensor ,which I have heard that they go bad pretty quick , especially if your car is running to rich .The cost for it is about $60.

1 of 1 people found the following review helpful:

5.0 out of 5 stars Reads nice and consistent!, August 14, 2011

By 

S. Baker - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: AEM 30-4100 UEGO Controller Gauge (Misc.)

If you're looking at this, you have probably souped-up your car and need to keep an eye on your air-fuel ratios.

This does that, and does it well. Readings are very consistent and this gauge has a reputation for accuracy.

You can use this gauge and also hook it up to a standalone engine management system for data-logging. The gauge housing is plastic...but it doesn't need to be a tank. The wiring is all very good, and not cheap-feeling in any way. Installation was also quite easy...you do need to have a +12V ignition source...and FUSE IT. If you melt a wire going to the O2 sensor, you could ground on the chassis and that could be real bad. This did not come with a fuse, but Autozone has solutions for that.

There are silver and black surrounds. The bezel is silver and black for AFR, or black for Lambda. There's a light sensor in the gauge, so it will get darker at night and not flood your interior with light. The sampling rate is quite high, so you'll know what your AFR is at any time. Sometimes the "needle" doesn't light when you're between discrete positions...but I only read the number so I don't care.

The picture would make you think you have only 6 inches from the gauge to the O2 sensor, but I think it's probably closer to 10 feet. there's a harness about 6 inches from the O2 sensor, so swapping them out will be easy if/when the wideband sensor breaks. New ones are like $75. Instructions were thorough, too.

I'm a relative noob to Forced Induction, but I was able to install this gauge myself in 2 hours or so. Most fuse boxes have a +12V ignition source on them, so you can use that. I'd recommend having a spade female fitting for the positive, and a ring terminal for the ground. I used crimping connectors; didn't feel the need to solder since it's inside the car.

3.0 out of 5 stars Decent product, not impressed with quality, April 21, 2011

By 

J. Proctor (Asheville, NC) - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: AEM 30-4100 UEGO Controller Gauge (Misc.)

This gauge was overall a good buy. It does what it is supposed to do and isn't very hard to setup. For that, it gets three stars (I'd do 3.5 if I could).
However, it's not the highest quality product I've worked with. I'm not at all impressed with the cheap plastic housing it comes with (I don't need lots of colors; I'd prefer higher quality parts). The housing is also bulky, so you'll have trouble fitting this into a lot of gauge clusters.
In addition, the screen messed up on me about 6 months after purchasing. One of the display lines stop working, so guessing at what number it was displaying was a bit of a chore. Not impressed. I would appreciate a higher quality display for the price.
Finally, I found it was a bit flashy and distracting. If that floats your boat, all the more power. But I don't need it to display a lot of unimportant information when I crank the car, etc. I want a simple and elegant read out that is functional.
Other than those complaints, this will get the job done. It's not too expensive, but I feel like it costs enough that it should avoid the problems I mentioned above.