Can it be used for fuel pressure? Gasoline?

I believe it could, however in most cases the pressure of a fuel system is more than 5 psi and the gauge would be damaged if over pressurized.There are 15 psi fuel gauges for carb or TBI systems, and 60 or 100 psi gauges for EFI.

Is the outer diameter of the thread mount 3/8 ?

No. these units are 1/4 inch npt (national pipe thread) which does nor correspond to "normal sizing". The outside diameter of 1/4 inch npt is .540 thousands or larger than half inch. 1/8 npt would be closer to 3/8 inch at .405 thousands. Keep in mind npt threads are all tapered and have a pitch.

Is there any indication the gauge is calibrated? For a pressure test, is there a way to indicate the starting point of the test?

the gauge is calibrated to measure pressures of zero to five psig. the starting point is "zero" the resting place of the dial when no pressure is applied. The markings between the numbers indicate fractions of a psog appears to be in tenths.

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KC25-5#

Product ID: 7462209

Details

Brand
Kodiak
Material
Brass Chrome
Item dimensions L x W x H
3.6 x 2.6 x
Item Weight
0.4 Pounds
UPC
853648005001

🔧1/4" NPT bottom mount for easy installation

⏱️2.5" dial for precise readings

🛡️Brass/bronze wetted parts for durability

₨26427

Duties & taxes included

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Details

Brand
Kodiak
Material
Brass Chrome
Item dimensions L x W x H
3.6 x 2.6 x

Description

📊 Master your pressure game with precision and style!

SAFETY FIRST - Chrome plated case offers robust protection and a sleek professional look.
BUILT TO LAST - Durable brass and bronze wetted parts resist corrosion and wear.
EFFORTLESS SETUP - Standard 1/4" NPT bottom mount fits seamlessly into your system.
FINE TUNE ACCURACY - Zero adjustment screw lets you calibrate for flawless performance.
PRECISION AT A GLANCE - Large 2.5" dial ensures quick, accurate low-pressure readings.

The KC25-5# Low Pressure Gauge features a 2.5-inch dial for clear visibility, a 1/4-inch NPT bottom mount for straightforward installation, and corrosion-resistant brass/bronze wetted parts. It includes a zero adjustment screw for precise calibration and a chrome plated case for enhanced durability and professional aesthetics, making it ideal for accurate low-pressure monitoring and gas leak detection.

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