Description
Gauges & Displays · Wideband AFR
Air/fuel data you can actually tune to — an auto-detecting Bosch LSU 4.9 wideband in a 52 mm gauge with a big digital readout and LED needle sweep.
52 mmGauge size (2 1/16")
LSU 4.9Bosch sensor
0–5V + CANData outputs
6 fuelsMulti-fuel ready
Overview
The AEM X-Series Wideband UEGO gauge gives you fast, accurate air/fuel-ratio readings for tuning and monitoring. It drives a Bosch LSU 4.9 wideband sensor directly and shows AFR — or Lambda / O2% — on a large seven-segment display ringed by an LED needle sweep. Auto-sensor detection means it also works with AEM's FAE sensor.
A 0–5V analog output feeds any standalone ECU or dash for closed-loop tuning, while the RS232 serial and AEMnet (CAN) outputs let you log digitally and daisy-chain multiple gauges for multi-cylinder readings. Suits EFI or carbureted engines, and the dyno.
Specifications
Gauge size52 mm (2 1/16")
SensorBosch LSU 4.9 (auto-detect AEM FAE)
Analog output0–5V
Digital outputRS232 serial + AEMnet CAN
Display7-segment digital + LED sweep
Readout modesAFR / Lambda / O2%
Fuel supportPetrol, E85, methanol, diesel, LPG, CNG
CalibrationFactory resistor + free-air
Max system voltage16V
Part number30-0300
What's in the box
- 52 mm X-Series wideband gauge
- Bosch LSU 4.9 wideband sensor
- Sensor wiring harness
- Weld-in bung + plug
- Interchangeable black & silver bezels
- White & black faceplates
Fitment
ApplicationUniversal — any EFI or carbureted engine
InstallNeeds an O2 bung in the exhaust (weld-in bung included)
Universal fit — no vehicle-specific wiring. Mount the sensor after the turbo/manifold and before the catalytic converter for accurate, sensor-safe readings.
Best suited for
Tuning
Standalone ECU
Dyno
Daily AFR monitoring
Position the sensor at least ~45 cm from the turbo/exhaust port and above horizontal so condensation drains away from it — this protects the sensor and keeps readings accurate.
Fast dispatchShips in 24–48h
Genuine productAuthentic AEM Electronics
Easy returns10-day returns, unused items
Setup helpWe'll help you wire & mount it
Returns
Return within 7 days of purchase, provided the item is unused and in its original condition and packaging. Taxes are non-refundable.
We can’t take back parts that have been fitted or modified, unsealed electrical components, ECUs and sensors, opened gaskets, seals and o-rings, or clearance items. Parts we order in specifically for you can’t be returned for change of mind — we’ll tell you before you order if yours is a special order.
If a part is faulty, damaged in transit or isn’t what you ordered, we’ll put it right and cover the return shipping.
Please contact us before returning anything. Full terms are in our Refund policy.
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