Do you need an air compressor or does it connect to the gas station pumps?

This is setup to connect to a 1/4" quick (dis)connect fitting. The QD fittings are what are almost always on the working end of air hoses which have a general purpose. In other words a shop, garage, etc. where different air tools may often be switched out on the hose end. Gas station air hoses really have just one intended purpose; to fill tires with air. Therefore they almost always have a Schrader type inflation tip. So out of the box, no this will not work at a gas station. By adding a bit extra to this, you can use it at gas stations. All you would need to do, is instead of threading in the supplied 1/4" QD male, put in what is called a tank valve. It will have the threading to attach to the inlet port of this tool, and have a Shrader valve (just like tires have) on it's other end. Here is one example of one that Amazon has for sale: https://www.amazon.com/Milton-S-684-4-MNPT-Male-Valve/dp/B001PLI4BA/ref=sr_1_4?keywords=schrader+to+1%2F4&qid=1575752685&sr=8-4

Is this a cheap knock off of the jaco flowpro tire inflator gauge? even the product description was copied?

There’s a JACO shown below this one. In neither case do you have a “Tire Inflator.” It’s a gauge. If you plug this thing into your tire thinking you’re going to inflate it, then you better hope you have a AAA membership, because an hour later you’re going to still have a flat tire. Very misleading product name. Amazon should have made it clear that an air compressor is required.

does it read pressure while inflating, or do you have to let go of the trigger to read the pressure?

You have to let go of the trigger to get the new reading.

Can you remove the clip on chuck and replace it with a dual head chuck?

Sir I think your asking if you can replace the tire valve chuck. I suppose one can if you unscrew the tire chuck from the fitting and your "dual head" device has matching screw in connection. If not I suppose you could remove the brass clamp on the hose and replace the entire chuck piece as long as your dual device has the appropriate sized nipple and you can crimp clamp it onto the hose.

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Specifications

Brand	AstroAI
Material	Rubber
Item dimensions L x W x H	21 x 8 x 8.5 Centimeters
Item Weight	590 g
UPC	756910382360 796358883623
Global Trade Identification Number	00756910382360
Manufacturer	AstroAI
Country of Origin	USA
Model number	ATG250
Product Dimensions	20.98 x 8 x 8.48 cm; 589.67 g
Batteries	1 Lithium Metal batteries required. (included)
Item model number	ATG250
Item Height	3.34 Inches
Item Width	3.15 Inches
Display Size	0.1 Inches
Voltage	3 Volts
Are batteries included?	Yes
Lithium battery energy content	0.75 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium battery weight	0.2 Grams
Number of lithium metal cells	1

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