What gauge of wire to use to mount this across a 12 volt marine battery

Remember voltage is read ACROSS the battery and not in series-with. So across a 12v battery, mine draws 5 ma (0.005 A). Therefore, whatever awg automotive wire you have is FINE!, as it draws next to zero current. (thousandths of an amp). For automotive use, for an auto that’s driven regularly, one [might] choose to wire it always ON (fuse-box always on), so that you can see the battery voltage WHILE cranking., as if your voltage significantly drops during cranking, you know your battery is potentially BAD.

What is the length of the threaded section? Can it be mounted to a 1/2” thick wall?

yes, there about a 1/2 of an inch long, you can always us different screw types if they don't work for your application.

Mine flashes 8.8.8. when hooked up. What does this mean? Right now 0 stars.

i had a 12V reader...and it was upside down. i would not buy anything else from this manufacture

Battery Voltage Meter | Desertcart Poland

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Sold byAmazon PolandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay Powered, Stay Ahead – Know Your Voltage at a Glance!

ALL WEATHER READY 💧 - IP65 waterproof design ensures reliable performance rain or shine, on land or sea.
PINPOINT PRECISION ⚡ - Measures DC 8-26V with razor-sharp 0.1V accuracy for real-time battery insights.
CRYSTAL CLEAR READOUT 🔢 - Bright 3-digit LED display guarantees easy voltage monitoring in any lighting condition.
UNIVERSAL COMPATIBILITY 🌍 - Perfect for cars, boats, motorcycles, RVs, ATVs, and more—your go-to voltage guardian.
SLEEK FLEXIBLE INSTALLATION 🔧 - Mounts effortlessly via panel or direct 29mm hole for a clean, professional dashboard look.

The Linkstyle DC Volt Meter 12V is a precision digital battery voltage gauge featuring 0.1V accuracy across 8-26V DC, a bright 3-digit LED display, and IP65 waterproof protection. Designed for versatile panel or direct mounting, it suits a wide range of vehicles including cars, boats, motorcycles, and RVs, delivering reliable, real-time battery status to keep you confidently on the move.

Specifications

ASIN	B07MC85HPB
Best Sellers Rank	#112,973 in Automotive ( See Top 100 in Automotive ) #51 in Automotive Voltmeter Gauges
Brand Name	Linkstyle
Color	Light Red
Customer Reviews	4.4 4.4 out of 5 stars (865)
Included Components	1 panel, 2 screws, 2 terminals
Item Weight	0.63 Ounces
Manufacturer	Linkstyle
Maximum Operating Voltage	24 Volts (DC)
Measurement Type	Voltmeter
Minimum Operating Voltage	12 Volts (DC)
Model	A06460R
Part Number	A06460R-L002300263FBA
Power Source	Corded Electric
Specification Met	UL
Style Name	Electronic
UPC	738944208731

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