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AutoMeter 4778 Air/Fuel Ratio-Pro, 2 1/16 Inch, W/ Peak and Warn

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#1824778

AutoMeter 4778 Air/Fuel Ratio-Pro, 2 1/16 Inch, W/ Peak and Warn

Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation
0-4v data output feed for ECU, data acquisition unit, or Laptop tuning
User programmable range for Rich/Stoic/Lean conditions

$376.99

/each

Factory Shipped

Quantity

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Product Summary

Universal Fit, 2-1/16" Overall Diameter, Carbon Fiber

Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation
0-4v data output feed for ECU, data acquisition unit, or Laptop tuning
User programmable range for Rich/Stoic/Lean conditions
Peak recall/memory
10:1 to 20:1 AFR range for gasoline applications

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Key Specs

MFG. Part #	4778
Brand	AutoMeter
Gauge Style	Digital

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AutoMeter 4778 Details

Knowing the exact air/fuel mixture running through your engine is the most important factor to extracting the highest levels of performance and durability. Not all wideband gauges are created equal. AutoMeter utilizes an advanced calibration method that automatically calibrates your gauge on every startup to assure you of the highest degree of accuracy over the entire lifespan of your sensor (no free air calibration is ever necessary). Compatible with nearly all fuel types, the AutoMeter Pro Wideband has a configurable display to pinpoint the exact range you want to keep an eye on. An advanced peak recall function and lean warning system make sure you're safely making power, whether on the track or on the street. An automatically dimming display tailors light output for any condition. Data logging output is included for one wire or two wire systems in both lambda or AFR. Our specially designed O2 sensor and wiring harness are included for ease of installation. Quite simply, there isn't a more accurate or easy to live with wideband gauge available on the market.

Feature Points

Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation
0-4v data output feed for ECU, data acquisition unit, or Laptop tuning
User programmable range for Rich/Stoic/Lean conditions
Peak recall/memory
10:1 to 20:1 AFR range for gasoline applications
12 and 16 volt compatible, compatible with nearly every street car or race car electrical system
User Programmable Warning Function
Display data in Lambda or numerical A/F ratio

Ships With

2243
M18X1.5 Fitting and Plug
2230

Rebates

AutoMeter Hod Holidays Up To $150 MIR Select Parts

Purchase $100 or more in eligible AutoMeter products between November 1 and December 31, 2026 and receive a mail-in rebate ranging from $10 to $150, depending on your total qualifying purchase amount. Eligible brands include AutoMeter, Auto Gage, Dedenbear, Marine, Pro-Cycle, Spek-Pro, STACK, and AutoMeter Test Equipment products. To qualify, submit a completed rebate form, your original sales receipt or invoice, and the original UPC/barcode labels cut from each product box. All rebate requests must be postmarked by January 31, 2027. One rebate per household per rebate period; offer cannot be combined with other promotions and is valid only on new qualifying purchases. Incomplete, late, illegible, or non-compliant submissions will be rejected. Rebate requests are subject to verification and approval by AutoMeter Products, Inc., valid for U.S. customers only, and may take up to 12 weeks to process.

Guides & Documents

Air/Fuel Ratio Gauges Installation Instructions (1824778)

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

AutoMeter 4778 Specifications

KEY SPECS
MFG. Part #	4778
Brand	AutoMeter
Gauge Style	Digital

GENERAL
Overall Diameter	2-1/16
Sold in Quantity	Each
Notes	Includes wide band oxygen sensor. This gauge displays both a bar graph and digital numbers. Air/fuel ratio can be programmed for gasoline and alternate fuels (ethanol, methanol, propane, and CNG) from 6:1 to 20:1, depending on fuel type.
Gauge Type	Electric
Gauge Range	Lean-Rich
Shape	Round
Sending Unit	Electrical
Gauge Face Color	Carbon Fiber
Bezel Finish	Silver
Sending Unit Included	Yes
Lighting Type	Digital LED
AFR Gauge Type	Wideband
Gauge Sweep	Digital Numeric
Includes Wire Harness	Yes
Includes Mounting Bracket(s)	Yes
GTIN Code	046074047787
Gauge Diameter	2-1/16"
Gauge Number Color	Multicolor
Lighted	Yes
Liquid Filled	No
Memory Storage	No
Playback	No

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