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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🔴 Precision pressure, compact power – never miss a beat in your HVAC game!

COMPACT POWERHOUSE - Small 2" cube design fits perfectly in your toolkit without weighing you down.
PRECISION AT A GLANCE - Large 3-1/8" red dial ensures quick, accurate pressure readings every time.
ROBUST PRESSURE RANGE - Handles pressures from 0 to 800 psi, covering a wide spectrum of professional applications.
TRUSTED BUILD QUALITY - Engineered for durability and reliability, making it a must-have for HVAC pros who demand precision.
VERSATILE COMPATIBILITY - Works seamlessly with R-22, R-404A, and R-410A refrigerants for all your HVAC needs.

The Yellow Jacket 49137 is a compact, durable pressure gauge featuring a large 3-1/8" red dial for easy reading, designed to measure pressures from 0 to 800 psi. Compatible with R-22, R-404A, and R-410A refrigerants, it’s an essential tool for HVAC professionals seeking accuracy and reliability in a portable form factor.