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AutoMeter 3870 GS Digital StepperMotor Wideband AFR Gauge

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#1823870

AutoMeter 3870 GS Digital StepperMotor Wideband AFR Gauge

Modern green LED through-the-dial lighting provides clear visibility during nighttime use
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

$259.99

/each

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Product Summary

Universal Fit, 2-1/16" Overall Diameter, Black

Modern green LED through-the-dial lighting provides clear visibility during nighttime use
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
AutoMeter’s race proven digital stepper motor electric instruments provide unmatched accuracy which is further increased by utilizing a self calibration sequence during power up
Display range of 8:1 to 18:1
Suitable for use with gasoline powered engines

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Key Specs

MFG. Part #	3870
Brand	AutoMeter

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AutoMeter 3870 Details

Mirroring the functions of Auto Meter's Street Wideband, the Digital Stepper Motor Wideband provides the most important functions necessary to make sure you're extracting the most power possible, safely. An analog needle display integrates seamlessly with other gauges and easily illustrates rate of change as well as the actual value. Our advanced auto calibration system 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). Designed for gasoline applications, this wideband gauge provides the same degree of accuracy and response as the Pro version, but at a reduced cost. Data logging output is included for one wire or two wire systems. Our specially designed O2 sensor and wiring harness are included for ease of installation.

Features Hi-Def through-the-dial green LED lighting
Includes 8ft. Wiring Harness
Includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor
Full sweep precision digital stepper motor meter movement.
Display range of 8:1 to 18:1
Suitable for use with gasoline powered engines

Ships with the following AutoMeter products:

Sending Unit(s):  2243
Adapters/Fittings:  M18X1.5 Fitting and Plug
Wire Harness:  5298
Mounting Hardware:  2230

Ships with the following AutoMeter products:

Sending Unit(s):  2243
Adapters/Fittings:  M18X1.5 Fitting and Plug
Wire Harness:  5298
Mounting Hardware:  2230

Charts

Installation Instructions (PDF)

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 (1823870)

CA WARNING:

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

AutoMeter 3870 Specifications

KEY SPECS
MFG. Part #	3870
Brand	AutoMeter

GENERAL
Overall Diameter	2-1/16
Sold in Quantity	Each
Gauge Type	Electric
Gauge Range	8:1-18:1 AFR
Gauge Face Color	Black
Bezel Finish	Bright Anodized
Sending Unit Included	Yes
Lighting Type	LED
Needle Color	Fluorescent Red
AFR Gauge Type	Wideband
Includes Wire Harness	Yes
Includes Mounting Bracket(s)	Yes
GTIN Code	046074038709

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