The pressures for refirigerants are different, but yes, you can use
134 gauges with another refrigerant, but you don't want to mix
refrigerant in the gauge and hose set. Thus there were R12 sets and
R22 sets. And now, I don't know how many sets. I think all or some
of the 500 series are compatible, thus one set could be used for all
compatible refrigerants. Best to use one set per R-Number.
I am still torqued because I had 2 R-12 gauge sets and both were
burned up last fall.
This thing I bought
http://www.harborfreight.com/a-c-manifold-gauge-set-92649.html says
it is only good for R134 though the hoses say R12/22/134. The
fittings are probably for 134, I have some adapters somewhere I
think. is there some reason the gauges would not work with R12 (or
Freeze 12 or a "test refrigerant"?)? To me a gauge just measures
pressure, should not really care what kind of fluid it is, within
reason. I seem to recall the former versions they sold said they
worked on all. HMMMM....
--R
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