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Good morning folks.
Me and my big mouth. Many people know I upgraded the AC in my 911 long ago and I know a little about automotive AC systems. Anytime someone asks for my help I tell them I only do R-12 systems and I didn't want to contaminate my equipment with 134a. That gets rid of them. Except a friend in the Porsche club has a old air cooled 911 that has never been converted to 134a. He is coming over tonight so I can help him with a little AC work. I guess that is what friends are for. 
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Lucky, I usually have people wanting to dip into our stash of R12....
We usually clear out our gauges between types.... Dad has a neat setup to hook up an air line and vac out the system.