would this gauge tell me how much puron is needed in my AC and heat unit?

No. You have to have both gauges low and high then other factors of the system as well. Better off calling a HVAC company. Also need epa license to handle Puron and other refrigerants.

Residue in gauges won't blend refrigerant even a little?

If using a different refrigerant, then you should run some nitrogen gas through them to clean out the residual refrigerant, as it might contaminate Ur system.

I have a r22 Mastercool manifold and hoses. Can just buy the yellow jacket high and low gauges and swap them out?

If you have the space to handle the diameter if they come out at a 45 degree angle you probably would but if they come straight up out of the manifold you may want to measure closely if your current gauge heads are close to the diameter of the yellow jacket then obviously it would work also there are 45 degree adapters available that you probably could put on your current gauges to get those yellow jacket ones to fit if they were too small of spacing

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Yellow Jacket Ritchie 49137 3-1/8" Red Pressure, 0-800 psi, R-22/404A/410A Gauge Degrees F

Product ID: 255090645

Details

Brand
Yellow Jacket
Item dimensions L x W x H
15.2 x 12.7 x
Item weight
1 Pounds
Material
Brass
UPC
686800491370

🎯Calibrated to 1% accuracy for precision

🔩1/8 inch NPT male connection for secure fit

🔴Color-coded red for instant pressure ID

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TrustScore 4.5 | 7,300+ reviews

Description

🔴 Stay ahead of the pressure curve with pinpoint precision!

TRUSTED OEM QUALITY - OEM-grade part with a 4.7-star rating from over 700 professionals—join the ranks of satisfied experts.
INSTANT VISUAL CLARITY - Bold red color coding lets you identify high-side pressure at a glance, saving time on the job.
UNIVERSAL COMPATIBILITY - Fits standard 1/8 inch NPT male connections, making it a seamless replacement or upgrade.
DURABLE BRASS CONSTRUCTION - Built to withstand tough job site conditions while maintaining long-term reliability.
PRECISION PRESSURE READING - Engineered for 1% calibration accuracy, ensuring reliable diagnostics every time.

The Yellow Jacket Ritchie 49137 is a high-side pressure gauge calibrated to 1% accuracy, designed for R-22, R-404A, and R-410A refrigerants. Featuring a color-coded red dial and a 1/8 inch NPT male connection, this durable brass gauge offers reliable, professional-grade performance trusted by HVAC technicians worldwide.

Specifications

ASIN	B00C2GWR5G
Brand Name	Yellow Jacket
Customer Reviews	4.7 4.7 out of 5 stars (706)
Global Trade Identification Number	00686800491370
Item Dimensions	15.2 x 12.7 x 3 centimeters
Item Weight	454 g
Manufacturer	Fotronic Corporation
Material Type	Brass
UPC	686800491370 794685158926
Unit Count	1 Count

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