As for the SwissFlow flow meter i am disapointed to not find any place to buy one easily. I might opt for this one
http://store.yahoo.com/pulseinstrume...ewimoinbo.html. I belive they have a version with just an anolog output instead of that LCD display. I asked them for specs and they actually REPLIED!
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Pressure 300psig/20Bar
Full Scale Accuracy +/- 1%
I hope that helps.
www.pulseinstrument.com