I would switch over to the 134, because R12 is just to much money!!! You can get a can of 134 for about $4-5 at Wal-Mart... R12 last time I checked was around $20, and you have to be registerd to buy it...
It's really not hard, buy the little kit with the new o-rings and its pretty much all spelled out for you in the kit...
Good luck!
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