Unless you plan on flushing or replacing the evaporator and condenser, you won't want to use PAG, it isn't compatible with the OEM R12 oil unless it's already been converted to PAG. Also, the condenser won't work that well with R134a. Is this a system that's been previously converted to R134a?

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

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1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k