The X-Series Wideband AFR OBDII Gauge includes an OBDII pass-through connector and 4.9LSU sensor that can be free-air calibrated or used with the factory resistor calibration. Additional wiring for a 0-5v or RS232 Serial output can be added by the user for outputting to a data logger. This OBDII pass-through capability replaces the traditional AEMnet stream available in the 30-0300 X-Series Wideband AFR Gauge Controller.
Gauge 1 — X-Series UEGO AFR Gauge w/ OBDII Connectivity
Key Features
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Fastest-responding wideband AEM has ever produced
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OBDII data output for clean AFR logging
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Bosch LSU 4.9 sensor included
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Reads AFR & Lambda for gas, E85, methanol, and race fuels
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52mm digital display with sweeping LED ring
Why It Matters
Accurate AFR is life support for any engine—especially turbo builds.
OBD integration eliminates analog signal noise and feeds AFR straight to your logs.
Gauge 2 — X-Series 35 PSI Digital Boost Gauge
Key Features
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Reads vacuum to 35 PSI of positive boost
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Extremely fast X-Series processor
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Supports internal or external wastegate turbo setups
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Perfect for small turbo, medium turbo, or high-boost street builds
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Bright digital readout + programmable LED alerts
Why It Matters
Boost spikes, boost creep, or slow spool? You’ll see it instantly.
This gauge catches boost issues before your engine does.
Gauge 3 — X-Series 0–150 PSI Fuel/Oil Pressure Gauge
Key Features
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Measures up to 150 PSI (fuel or oil)
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Ideal for EFI fuel systems, E85 builds, and high-RPM oiling
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High-accuracy digital pressure readings
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Outputs data to ECUs and data loggers
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Includes user-programmable warnings
Why It Matters
Pressure drops = blown engines.
This gauge gives you early warnings so you can lift before your engine vents itself.
Complete System Benefits
Perfect for Turbo & High-Performance Builds
You get:
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Precise AFR
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Stable boost tracking
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Accurate fuel/oil pressure data
Everything needed for:
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Street tuning
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Dyno sessions
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Track safety
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Engine protection
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Flex-fuel or high-pressure setups
X-Series = Fastest Digital Gauges Available
AEM’s X-Series logic gives:
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Faster data refresh
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More stable readings
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Superior ECU/datalogger compatibility
Universal 52mm Fit
Drop into:
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A-pillar pods
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Steering column pods
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Center dash panels
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Custom 3-gauge clusters
Installation Notes
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AFR sensor requires welded O2 bung (or existing wideband port)
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Boost gauge requires boost reference line to MAP sensor
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Pressure gauge requires compatible 0–150 PSI sending unit
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OBDII cable plugs directly into vehicle OBD port
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Route wiring away from manifolds/turbos/heat sources
Average install time for full three-gauge setup: 2–3 hours.
Final Verdict
The AEM X-Series UEGO + Boost 35 PSI + Fuel/Oil Pressure 0–150 PSI Gauge Set is one of the most complete and accurate gauge combinations you can run on a performance vehicle.
With ultra-fast data processing, OBDII integration, and motorsport-grade sensors, this kit delivers everything needed for tuning precision and engine protection.
If you’re serious about your build — this is the gauge package you want.
Juan Ramirez –
i Used these three gauges on my turbo civic, the features that each gauge has for safety and setting targets are great, specially when you are pushing your engine to those limits.