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If it is still R-12 system you just have to have the correct ends on your guage lines..
If your car has the proper low pressure switch on the reciever dryer ( or close to it ) for safety cut off of the compressor in case of refrigerant leak then it will need to be jumped for insertion ( usually how it is done)... and the safer method...
It is pretty much the same... but do not overfill..... that is the kiss of death for efficiency. Lots of great threads in the archives....
But the bigger question for the long term happiness with your car is why it is needing any refrigerant... do you really need to check for and fix leaks before you put any R12 in ?
That 609 license is an OPEN BOOK test taken over the internet which only costs about $20 the last time I looked.... so that should not be a problem...
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