what is the depth front to back of fitting

Typically the threaded length equals the pipe thread size. A 3/8” pipe thread is threaded 3/8 from the end a1/2” pipe thread is threaded 1/2” long etc

Anything to do with the huge air bubble or incomplete fluid fill? I've tried the plug, didn't remove the air ?

You want the air bubble because liquids expand under heat. The air will compress as the liquid expands. The hotter the gauge the smaller the air bubble. If there was no air bubble as soon as the gauge got warm from engine heat it would spit fluid out.

I assume this gauge is suited for use measuring water pressure?

It is for low pressure gasoline 0 to 15 PSI. I am not sure what use it would have for water pressure which is generally 30 to 60 PSI. I am sure it is not sanitized for drinking water either. I would look for a gauge designed for water. I just bought on for my RV. It is a 0 to 100 PSI, it oil filled, and rated for potable water. It also has the correct thread size to work with water lines.

can it be used for oil pressure ?

no, would not use for oil pressure!

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MEASUREMAN Fuel Pressure Gauge Kit 0-15Psi Stainless Steel Glycerin Filled, 1-1/2" Dial Size, with 5/16" Fuel Line Fuel Pressure Brass T-Fitting Adapter, Lower Mount

MEASUREMAN Fuel Pressure Gauge Kit 0-15Psi Stainless Steel Glycerin Filled, 1-1/2" Dial Size, with 5/16" Fuel Line Fuel Pressure Brass T-Fitting Adapter, Lower Mount

Product ID: 534330800

Details

Brand
MEASUREMAN
Item Weight
0.15 kg
Item dimensions L x W x H
3.54 x 3.35 x
Material
Stainless
Number of Items
1

⛽0-15 PSI precision range

📏1.5" dial for clear readings

🛠️Stainless steel & brass durability

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Description

⛽ Stay ahead of the curve with precision fuel pressure insights!

GLYCERIN FILLED STABILITY - Glycerin-filled dial reduces needle vibration for smooth, easy-to-read pressure readings under all conditions.
VERSATILE T FITTING ADAPTER - Includes 5/16" brass barbed T-fitting adapter for seamless installation directly into your fuel line.
RUGGED STAINLESS STEEL BUILD - Durable stainless steel case and brass wetted parts ensure long-lasting resistance to wear and corrosion.
COMPACT USER FRIENDLY DESIGN - 1.5" lower mount dial with stainless steel clamps offers easy setup and clear visibility in tight engine bays.
PRECISION FUEL PRESSURE MONITORING - Accurately measures 0-15 PSI with ±3-2-3% accuracy for reliable engine performance insights.

The MEASUREMAN Fuel Pressure Gauge Kit offers professional-grade 0-15 PSI measurement with a robust stainless steel and brass construction. Its glycerin-filled 1.5" dial ensures stable, accurate readings, while the included 5/16" brass T-fitting adapter allows easy integration into your fuel line. Perfect for automotive pros and enthusiasts who demand reliable, precise fuel pressure monitoring.

Specifications

ASIN	B0BY93LTMP
Best Sellers Rank	#11,744 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Fuel Pressure Gauges
Brand Name	MEASUREMAN
Customer Reviews	3.9 3.9 out of 5 stars (50)
Included Components	Fuel Pressure Gauge,Fuel Pressure Adapter Brass T-Fitting
Item Dimensions	3.54 x 3.35 x 1.18 inches
Item Weight	0.15 kg
Manufacturer	MEASUREMAN
Material Type	Stainless Steel
Model	MA173
Number of Items	1
Part Number	MA173
Thread Style	Npt
Unit Count	1 Count

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$48.23

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In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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TrustScore 4.5 | 7,300+ reviews

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