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

ASIN	B00C2GWR5G
Best Sellers Rank	#35,711 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #60 in Industrial Pressure Gauges
Brand	Yellow Jacket
Date First Available	February 22, 2008
Global Trade Identification Number	00686800491370
Is Discontinued By Manufacturer	No
Item Weight	8 ounces
Item dimensions L x W x H	6 x 5 x 1.2 inches
Item model number	49137
Manufacturer	Fotronic Corporation
Material	Metal
Product Dimensions	6 x 5 x 1.2 inches
Thread Type	1/8 Npt
UPC	686800491370 794685158926

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

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