What is the max psi on the input side

The instructions just say max. pressure 145 lbs. with no mention of input or out put. I assumed input but after reading the add I see it is out put. So I don't think I can help you. I would try to check directly with the mfg.

Is it supposed to hiss (leak air) when it is set to a pressure lower than the tank?

As you adjust the pressure downward, the regulator will let a little wisp of air out as you turn the knob. However, it should not leak air at any other time. If yours is leaking continuously, something is wrong with it.I should add that William R and I both assume the hissing is "leakage out" from the regulator, such as around the knob. The regulator will 'leak through' to maintain the set pressure downstream. If your downstream system has a leak, the regulator will allow air through to make up for the leakage. This would be normal operation.

When looking down at the top of the knob, what side is the gauge on? And, does it have an L or R stamped on it?

It should have arrows or in/out to indicate the direction of flow for your connections so base your fittings based on that. with the supplied bracket and the right fittings (1/8" npt nipple and 1/8" npt female/female elbow), you can have the gauge face out, up, down, left or right.

Would the regulator fit on a 24 oz CO2 bottle with a pin valve

That I do not know, But these type of gauges and regulators are meant to be used with compressed air usually no more than 250 psi. And to the best of my knowledge, compressed gases such as C02 is normally around 3000 psi. To get a definite answer, I would consult with the manufacturer of the product.

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🔧 Elevate Your Air Game with Precision Control!

DURABLE DESIGN - Built to withstand the rigors of any workspace.
1 YEAR WARRANTY - Peace of mind with a limited warranty.
USER FRIENDLY KNOB - High impact composite knob for effortless adjustments.
PRECISION AIR CONTROL - Maintain constant air pressure with ease.
VERSATILE PRESSURE RANGE - Accurate regulation from 1 to 145 PSI.

The Primefit R1401G Mini Air Regulator is engineered for professionals seeking reliable air pressure regulation. With a robust steel-protected gauge and a user-friendly locking knob, this regulator ensures precise control from 1 to 145 PSI, making it an essential tool for any workshop or job site. Weighing only 0.4 pounds and compactly designed, it’s perfect for on-the-go applications, backed by a 1-year limited warranty.

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Brand	Primefit
Item dimensions L x W x H	11 x 4 x 4 inches
Item Weight	0.4 Pounds
UPC	816227016164 787721681359
Global Trade Identification Number	00816227016164
Manufacturer	Primefit
Part Number	R1401G
Item Weight	6.4 ounces
Product Dimensions	11 x 4 x 4 inches
Country of Origin	China
Item model number	R1401G
Is Discontinued By Manufacturer	No
Style	Mini Air Regulator
Item Package Quantity	1
Included Components	Air Regulator
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 Year Limited

Primefit R1401G Mini Air Regulator with steel-Protected Gauge, 60-Scfm At 100-Psi, 1/4" Npt

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