Gauge 1 — AEM UEGO Wideband AFR Gauge
Key Features
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Uses Bosch LSU 4.9 O2 sensor
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Ultra-fast AFR & Lambda readings
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Supports gasoline, E85, methanol, and race fuels
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52mm (2-1/16”) digital display
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Interchangeable faces & bezels
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Output options for ECU, datalogger, or digital dash
Why It Matters
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Essential for tuning
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Prevents lean conditions under boost
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Provides accurate AFR for power and safety
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The standard for turbo engine calibration
2 popular AEM gauges in a convenient combo set. All gauges are brand new, complete in box.Set Includes:AEM Wideband UEGO Air/Fuel Ratio Gauge 30-4110
AEM Boost Display Gauge (-30-35PSI) 30-4406
This gauge is easy to read, highly accurate, and controls its data by a digital LED display and LED needle that will change colors as the ratios change from rich to lean. Utilizing a Bosch 4.9 LSU sensor.Features:Gauge Display/0-5V Output Gasoline values from 10 to 20:1 AFR
0-5V Output E85 values from 6.6 to 13.2:1 AFR
0-5V Output Ethanol values from 6.14 to 12.3:1 AFR
0-5V Output Methanol values from 4.4 to 8.8: AFR
Gauge Display/0-5V Output Lambda values from 0.68 to 1.36
Interchangeable black and white faceplates included Compatible with customizing gauge appearance (digital gauges only)
Gauge 2 — AEM -30 to +35 PSI Digital Boost Gauge
Key Features
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Reads vacuum and boost up to 35 PSI
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Fast X-Series digital processing
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Accurate MAP sensor input
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LED digital display with sweeping outer LED ring
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52mm universal fit
Ideal For
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Single or twin-turbo builds
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Internal or external wastegate setups
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Street, drift, track, and drag applications
Why It Matters
Boost levels change fast.
This gauge shows:
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Boost creep
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Spikes
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Turbo spool behavior
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Vacuum conditions
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Wastegate performance
…all in real time.
Bosch 4.9 LSU wideband sensor and weld-in bung included (PN 30-4110)
No free air sensor calibration required – ever
Interchangeable black and silver bezels included
Interchangeable black and white faceplates included
MAPerformance Lanyard (Bonus)
A clean add-on for:
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Keys
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Track passes
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Shop badges
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Garage or tuner use
Not a performance part, but a nice touch.
52mm (2-1/16”) gauge housing
0-5v analog output (10-20 AFR range only)
AEM Boost Display Gauge (-30-35PSI) 30-4406Features:Gauge Readout from -30 to 35PSI
Includes easy-to-install harness and sensor
Complete stand alone gauge requires no additional sensors or programs to operate
Why This Kit Is Perfect for Turbo Builds
Together, these gauges give you the two most critical pieces of data your engine needs:
AFR (Air/Fuel Ratio)
Avoids:
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Lean detonation
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Misfires
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Fuel starvation
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Engine meltdown
Boost Pressure
Avoids:
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Overboost
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Wastegate failure
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Turbo overspeed
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Fuel pressure mismatch
Whether you’re street tuning or pushing a high-boost setup on the track, this kit keeps your engine safe and your tune accurate.
Includes black and silver bezel and white and black faceplates
Ideal Compatible with both fuel injected and carbureted motors
Installation Notes
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AFR sensor requires a welded O2 bung (unless your exhaust provides one)
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Boost gauge uses manifold vacuum/boost reference
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Both gauges require switched 12V power
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Keep wiring/hoses away from high-heat components
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Output wiring can be connected to standalone ECUs for logging
Average install time: 1–2 hours.
LED displays provide precise reference to critical operating conditions and alert driver of potentially damaging operating conditions
Boost gauge includes AEM 3.5BAR brass sensor
0-5v analog output included Compatible with use with data loggers and virtually any engine management system
Final Verdict
The AEM 2-Gauge Display Set (UEGO AFR + Boost 35 PSI) is the ideal combo for any turbocharged or high-performance build.
Accurate AFR + precise boost data = safer tuning, more power, and better engine reliability.
The included MAPerformance lanyard is a nice extra, but the real value is in the two gauges every boosted car should have.
If you’re running boost, this is the foundation of a proper monitoring setup.
Kevin s. –
These gauges work well and are easy to read. I have been through two O2 sensors but I think it is my own fault. I need to wire them on a switch I can turn on after the engine has warmed up to prevent moisture getting on the sensor.
Lonnie F. Groves –
Fit real good .
Troy Moor –
Ive only had these gauges for a month now but so far they have been great. Accurate, easy straight forward install, very easily ready, i would buy again
Randy –
shawn –
Wideband works great i have several all work great and are accurate. Have used aem for widebands and boost controllers for years. First time using a aem boost gauge thats not a controller. I waited to long to install it to return it. It seems accurate but there is no color variation from vac to boost or a – symbol in the digital reading. Like on the boost controllers gauge. This makes it almost impossible to tell (especially at night time) at cruising speeds and light throttle if you are in light vac or boost. Say -5 or 5 it just looks like 5. I would have gotten the analog style or boost controller with gauge had i known.
David Martínez –
John –
Purchased May 27 ,2020. This update is June 6 2021.Well, the first boost gauge was faulty out of the box. Here we are just over a year from my purchase and the replacement boost gauge is no longer working. AEM was terrible to deal with last time so I’m gonna go ahead and just replace these gauges with something else.
cone –
The o2 sensor needs to be inspected for excess antisieze! Ideally you should be using o2 sensor safe antisieze or dont use any at all. The o2 sensor failed on warm up also even though the instructions say “do not leave sensor in gas stream with out power to heater powered” it is highly advised to wait for condensation to be burned off prior to powering sensor to prevent thermal shock of the ceramic element. I’m not sure if it was the antisieze or the exhaust condensation from an overly rich warm up condition that caused the sensor to fail after about 5 mins. I am planning to run a time delay relay controller until engine warm up to then start up the sensor to prevent thermal shock.