If you are using a keg and digital bathroom scale will help tell how much has been added. Using refrigerant cans make this measurement easier because each can will be 8 ounces etc. This guide will successfully recharge the system even if this information is not available....
nor can you add R134a refrigerant to a R1234YF system. R134a and R1234YF have different low pressure port types, so you should never use a recharge adapter to add the wrong type of refrigerant. Recharging your CR-V with the wrong type of freon can make the AC recharge cost much ...