What is the inlet size? npt? male or female?

I don't know the inlet size or npt, but I know its a male.

Why is their an Air bubble inside the gauge

The air bubble is needed for the purpose of dampening the internal pressure to ensure accurate readings. It is necessary for the air bubble to be there so that the gauge will work properly since air provides a cushioning effect for the gauge

Can i hook this up to a line to have it on the dash instead of directly on the bottle?

Yes I have done mine that way, it works

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Nitrous Express 15508 0-1500 psi Nitrous Pressure Gauge Regular, 1.625 in.

Product ID: 301062654

Details

Brand
Nitrous
Item weight
136 g
Material
Plastic
Number of Items
1
Thread type
1/8" NPT 1/4"

💧Liquid-filled for accuracy

📏Precision 0-1500 psi range

⚙️Compact 1.625-inch size

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C$8518

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay ahead of the pack with precision pressure power!

LIQUID FILLED STABILITY - Ensures vibration dampening and reliable readings under high-stress conditions.
COMPACT DURABLE DESIGN - 1.625-inch gauge fits seamlessly into any setup without sacrificing durability.
PROFESSIONAL GRADE BUILD - Thread styles 1/8" NPT female and 1/4" NPT male for versatile installation.
TRUSTED BRAND RELIABILITY - From Nitrous Express, a leader in automotive performance components.
PRECISION PRESSURE MONITORING - Accurately measures nitrous pressure from 0 to 1500 psi for optimal performance tuning.

The Nitrous Express 15508 is a high-accuracy, liquid-filled nitrous pressure gauge measuring 0-1500 psi, designed for professional automotive use. Its compact 1.625-inch size and versatile thread fittings make it an essential tool for precise nitrous system monitoring and performance optimization.

Specifications

ASIN	B000MKI9BK
Best Sellers Rank	#27,646 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Gauge Sets
Brand Name	Nitrous Express
Global Trade Identification Number	00653374002783, 00653374155083
Included Components	Nitrous Express 15508 0-1500 psi Nitrous Pressure Gauge Regular, 1.625 in.
Item Type Name	Nitrous Express 15508 0-1500 psi Nitrous Pressure Gauge Regular, 1.625 in.
Item Weight	136 g
Manufacturer	Nitrous Express
Material Type	Plastic
Model	15508
Part Number	15508
Thread Style	1/8" NPT female, 1/4" NPT male
UPC	653374002783 653374155083
Unit Count	1 Count

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