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check this site out. Very informative http://www.delanet.com/~pparish/index.htm
I think you'll find it in there. I remeber seeing static and dynamic pressure for R134 in there.
Well that chart shows the vapor pressures for R12 anr 134A which gives me a good idea of what the air temp should be for a given inlet pressure but.... this does not really tell me what is considered the correct inlet and outlet pressures for a stock R12 setup.