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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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"

⚡0-1500 psi high range

💧liquid-filled for accuracy

📏1.625 in. precision dial

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NZ$172

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

NZ$172

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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

Secure transaction

Description

⚙️ Gauge your boost, own the race!

WIDE PRESSURE RANGE - Measures from 0 to 1500 psi to cover all nitrous boost needs.
LIGHTWEIGHT DURABLE - At just 136g, it’s engineered for performance without bulk.
PRECISION AT A GLANCE - Compact 1.625-inch dial fits seamlessly into your performance setup.
TRUSTED BRAND QUALITY - From Nitrous Express, a leader in automotive performance gear.
LIQUID FILLED ACCURACY - Ensures stable, vibration-resistant readings for reliable tuning.

The Nitrous Express 15508 is a compact, liquid-filled nitrous pressure gauge with a 1.625-inch dial, measuring pressures from 0 to 1500 psi. Designed for high accuracy and durability, it’s a lightweight essential for precise nitrous system monitoring, crafted by a trusted automotive performance brand.

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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