What is the black dot/hole near the 12 on the faceplate?

It is the daylight sensor that helps adjusting the dim on the LED display.

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D2 Digital Wideband O2 Air Fuel Ratio Controller All-in-One 2 1/16" (52mm) Gauge Blue

D2 Digital Wideband O2 Air Fuel Ratio Controller All-in-One 2 1/16" (52mm) Gauge Blue

Product ID: 24663260

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Details

Brand
APSX
Material
Polycarbonate
Item dimensions L x W x H
2 x 1 x 2
UPC
881314598113
Global Trade Identification Number

📊9600 baud digital output

🔵2 1/16" vibrant blue gauge

⚙️Configurable fuel & calibration

Description

🔵 Drive smarter, not harder — master your air-fuel ratio with style!

COMPACT POWERHOUSE - Sleek 2-inch gauge fits anywhere, delivering big data in a stylish, durable polycarbonate shell.
TAILORED CALIBRATION - Customize fuel types, upper/lower limits, and calibration settings to match your exact engine needs.
PLUG PLAY DIGITAL DATA - 9600 8N1 serial digital output lets you effortlessly connect to PCs and data loggers—no hassle, just insights.
SEAMLESS EMS INTEGRATION - Analog output perfectly syncs with MegaSquirt and other engine management systems for real-time precision.
EYE CATCHING BLUE DISPLAY - Stand out on the dash with a vibrant blue gauge that’s as functional as it is fashionable.

The APSX D2 Digital Wideband O2 Air Fuel Ratio Controller combines analog and digital outputs for seamless engine management and data logging. Featuring a 2 1/16" vibrant blue gauge, it offers customizable calibration settings and supports real-time monitoring with MegaSquirt compatibility, all housed in a durable polycarbonate case.

Specifications

Brand	APSX
Material	Polycarbonate (PC)
Item dimensions L x W x H	2 x 1 x 2 inches
UPC	881314598113
Global Trade Identification Number	00881314598113
Manufacturer	APSX
Item Weight	15.2 ounces
Product Dimensions	2 x 1 x 2 inches
Item model number	APSX_D2_WRG
Is Discontinued By Manufacturer	No
Manufacturer Part Number	APSX_D2_WRG

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