52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-0300 LSU 4.9 Probe Sensor

A lean mixture under load is the sort of problem worth seeing coming, and nothing on a standard dash will show it. This 52 mm gauge reads air/fuel ratio in real time from the LSU 4.9 probe in the kit, so mixture becomes a number on the pillar.

Built around an LSU 4.9 probe

The kit runs its own LSU 4.9 wideband sensor rather than borrowing a signal from the switching sensor a standard engine uses. A switching sensor only says which side of the line the mixture is on; a wideband probe reports a value across the range, which is what makes it useful during a road-load pull rather than only at idle.

A direct-replacement 52 mm fit

The gauge measures 52 mm (2 1/16 in), the size most pods and dash cut-outs are already made for, so it drops into existing hardware without adaptors. Wiring comes prepared: a PWR/IO cable, sensor harness, four butt connectors and a nut for the sensor.

Key features

• LSU 4.9 probe included: the sensing element is in the box.
• Real-time readout: the supplier's stated point of difference.
• 52 mm (2 1/16 in) case: matches standard pods and dash apertures.
• Harness supplied: power cable, sensor lead, connectors and mounting nut.

Specifications

• Type: wideband air/fuel ratio gauge kit
• Gauge size: 52 mm (2 1/16 in)
• Sensor: LSU 4.9 wideband probe
• Reference OE number: for 30-0300

What's in the box

• 1 x UEGO gauge
• 1 x wideband oxygen sensor
• 1 x PWR/IO cable
• 1 x sensor harness
• 4 x butt connectors
• 1 x nut
• 1 x installation instruction

Fitting and use

• An aftermarket part referenced to 30-0300, not a genuine one. Check it against your pod and wiring first.
• No vehicle compatibility list is published, so confirm the fitment yourself.
• Reading a mixture and correcting one are different jobs; leave fuel and exhaust work to someone competent.

Sensible instrumentation for a modified engine, fitted before anyone adjusts a fuel map.

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