AEM 30-0300NS X-Series Wideband UEGO AFR Gauge 52mm No Sensor Universal

Vehicle Fitment

• Universal - compatible with all carbureted and fuel-injected vehicles, engine dynamometers, and any application requiring wideband AFR monitoring
• Suitable for gasoline (including leaded race gas), methanol, ethanol (including E85), diesel, propane, and CNG fuel systems
• Compatible with supply voltages up to 16V - suitable for 12V automotive systems including high-output charging setups

Fitment Notes

• Sensor NOT included. The 30-0300NS is the gauge-only version. A compatible AEM/FAE or Bosch LSU 4.9 wideband O2 sensor and bung/fitting for exhaust installation must be sourced separately. For the complete kit with sensor, see AEM PN 30-0300.
• Requires a 52mm (2-1/16") gauge pod, pillar pod, or A-pillar mount for installation. The ultra-slim 0.825" overall depth and 0.200" cup depth dramatically expand mounting location options compared to conventional gauges.
• Optional silver bezel and white dual-faced faceplate accessory kit sold separately (PN 30-0300-ACC).

Features

• Patented X-Digital Wideband Technology (Patent 9,575,030): AEM's X-Digital technology was independently tested as the fastest-responding wideband AFR controller against 17 competitor wideband UEGO gauges. Faster response time means more accurate real-time tuning feedback - critical for data logging and live AFR monitoring during both street tuning and track use.
• Auto-Sensor Detection: The 30-0300NS automatically detects whether an AEM/FAE or Bosch LSU 4.9 wideband sensor is connected - no manual configuration required when switching between sensor types. This provides flexibility for users who may already own a Bosch LSU 4.9 sensor from a previous wideband setup.
• 52mm Gauge with 24-Color-Coded LED Display + 4-Digit Center Readout: The 52mm mounting surface houses a modern faceplate with a sweeping 24-LED color-coded arc display for immediate visual AFR reference, plus a four-digit center display that is 87% larger than the previous-generation 30-4110 gauge. The larger center display provides clear numeric AFR or Lambda readings at a glance.
• Ultra-Slim Depth: Overall gauge depth of 0.825 inches with only a 0.200-inch gauge cup depth - dramatically thinner than conventional analog or digital gauges. This opens mounting options in tight locations including pillar pods, shallow dash cutouts, and custom panels where deep-cup gauges cannot fit.
• User-Configurable Display: Front-panel buttons allow the user to switch the display between AFR (fuel-specific values), Lambda, and O2% readings; toggle between 3- and 4-digit display modes; and configure the CAN message ID for daisy-chaining multiple X-Series controllers.
• Multiple Data Outputs: Three simultaneous output options for data logging and ECU integration: a 0-5V analog output compatible with virtually all aftermarket ECUs and data loggers (including AEM Infinity EMS); an RS232 serial data stream; and an AEMnet CANbus output for native AEM data logging and daisy-chaining up to 16 X-Series controllers for multi-cylinder/multi-bank monitoring.
• Broad Fuel Compatibility: Supports gasoline (including leaded race fuel), E85, ethanol, methanol, diesel, propane, and CNG - covering the full spectrum of performance and alternative fuel applications without requiring separate gauge hardware.
• Auto-Dimming: Gauge brightness automatically adjusts to ambient light conditions for comfortable visibility in both bright daytime and low-light nighttime environments.
• Locking Connectors and Single-Board Design: Locking wiring harness connectors ensure a secure, positive connection that resists vibration-induced loosening. The single-board internal design improves long-term durability and reduces potential failure points compared to multi-board designs.
• Factory Calibrated Sensor Trim Resistor: When used with an AEM/FAE sensor, the sensor connector includes a laser-etched calibration resistor specific to that individual sensor - providing factory-level accuracy without requiring manual calibration. Free-air calibration is also available for aging sensor compensation.

Specifications

• Part Number: 30-0300NS
• Brand: AEM Electronics (AEM Performance Electronics)
• Product: X-Series Wideband UEGO AFR Gauge - No Sensor
• Technology: X-Digital Wideband (US Patent 9,575,030)
• Gauge Diameter: 52mm (2-1/16 in)
• Overall Gauge Depth: 0.825 in
• Gauge Cup Depth: 0.200 in
• Sensor Compatibility: AEM/FAE Wideband UEGO; Bosch LSU 4.9 (auto-detected)
• Supply Voltage: Up to 16V
• LED Display: 24-color-coded LEDs (sweeping arc) + 4-digit center display
• Display Modes: AFR, Lambda, O2% (user-selectable); 3- or 4-digit (user-selectable)
• AFR Display Range (gasoline): 8.0:1-20.0:1
• Lambda Display Range: 0.55-2.00
• 0-5V Output Range (gasoline AFR): 8.5:1-18.0:1
• 0-5V Output Range (E85): 5.7:1-12.0:1
• 0-5V Output Range (ethanol): 5.2:1-11.0:1
• 0-5V Output Range (methanol): 3.75:1-8.0:1
• Outputs: 0-5V analog, RS232 serial, AEMnet CANbus
• CANbus Daisy-Chain Capacity: Up to 16 X-Series controllers
• Included Bezel/Faceplate: Black bezel + black double-sided (AFR/Lambda) faceplate
• Optional Accessory: Silver bezel + white faceplate kit (PN 30-0300-ACC, sold separately)
• Fitment: Universal

Included Components

• 1x AEM X-Series Wideband UEGO AFR Gauge (30-0300NS)
• Power/IO Wiring Harness
• UEGO Sensor Harness
• Black Bezel
• Black Double-Sided Faceplate (AFR / Lambda)
• Note: Wideband O2 sensor NOT included - AEM/FAE or Bosch LSU 4.9 sensor required, sold separately

Product Description

The AEM 30-0300NS is the gauge-only version of AEM's X-Series Wideband UEGO AFR Controller Gauge - the same 52mm instrument found in the full 30-0300 kit, supplied without the wideband O2 sensor for users who already own or prefer to source an AEM/FAE or Bosch LSU 4.9 sensor separately.

Built on AEM's patented X-Digital wideband technology, the 30-0300NS was independently tested as the fastest-responding wideband AFR controller against 17 competing products. Its auto-sensor detection eliminates manual configuration when switching between AEM/FAE and Bosch LSU 4.9 sensors, and its three simultaneous data outputs - 0-5V analog, RS232, and AEMnet CANbus - make it compatible with virtually every aftermarket ECU and data logger on the market, as well as AEM's own Infinity EMS. The CANbus output supports daisy-chaining up to 16 X-Series controllers for multi-cylinder or multi-bank monitoring on complex builds.

The gauge's 87% larger center display over the previous-generation 30-4110, combined with the 24-LED color arc, provides excellent real-time AFR visibility. The ultra-slim 0.200" cup depth makes it installable in mounting locations that conventional gauges cannot fit. Supports gasoline, E85, ethanol, methanol, diesel, propane, and CNG. Universal fitment - suitable for any carbureted or EFI vehicle, engine dyno, or race car application.