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52mm dual-display air-fuel gauge with stepped needle and seven-colour LED dial

Dyno Racing

Dyno Racing 52mm Dual Display Air Fuel Ratio Gauge 7 Color LED Stepper Motor

SKU CH-3WKK-9P9WK

A 52 mm air/fuel ratio gauge with dual display, seven-colour LED lighting and a stepper motor for clear needle movement in all 12 V vehicles

  • Gauge typeAir Fuel Ratio
  • Product typeGauges
  • Precise readings via stepper motor for responsive needle movement
  • Dual display shows both numeric value and pointer position clearly
  • Seven LED colours give bright dial visibility in darkness
  • Universal fit for any 12 V vehicle electrical system
  • 52 mm diameter suits standard gauge pod openings

52mm Air Fuel Ratio Gauge

This 52mm air fuel ratio gauge uses a stepper motor for responsive needle movement and clear numeric display. It fits a standard 2-inch dashboard cut-out and operates on any 12V vehicle electrical system. The unit includes a seven-colour LED backlight for low-light visibility and ships with an English manual and mounting accessories.

Installation and common issues

Wiring requires a 12V ignition feed and illumination supply, each drawing up to 0.3A, so connections must be clean and secure. The gauge is a narrowband type, meaning it indicates rich or lean around stoichiometry rather than providing precise lambda values. Professional fitting is strongly advised to avoid incorrect readings caused by poor grounding or sensor placement.

Narrowband measurement limitation

This gauge reports only rich or lean condition near the stoichiometric point and cannot display exact air-fuel ratios across the full operating range. Builders who need precise lambda data for tuning or wide-open-throttle verification will find this instrument unsuitable. It is intended as a cockpit indicator for street-driven 12V vehicles.

How it compares

Measured against everything we stock in Gauges & Tachometers, at today’s prices. Recalculated every night.

Price $44.99
Pricier than about 62% of the 193 comparable items (median $35.99).

Specifications

Product
Product typeGauges
More details
Gauge typeAir Fuel Ratio

Questions about this item

How do I verify the stepper motor pointer and LED numbers respond correctly after wiring the gauge to a 12 V ignition source?

Power the unit with the ignition on; the stepper motor should sweep the needle and the seven-colour LED digits must light across the full 52 mm dial, confirming the narrowband signal is being read.

What components come in the package and what must I source separately for a 12 V vehicle install?

The box contains the 52 mm gauge, an English instruction sheet and the mounting accessories shown; you will need to supply a compatible narrowband oxygen sensor and wiring to the 10-15 V ignition circuit.

Which version of this 52 mm air-fuel ratio gauge should I choose for a standard 12 V car installation?

Only the universal 12 V narrowband model is listed; it operates on 10-15 V DC with a maximum ignition draw of 0.3 A and suits any 12 V vehicle when professionally installed.

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