Tools for A/C work

[Kneale Brownson]

Local pricing on R-12 refills is about $250.  R-134A conversions run in
that same price range.  I'd like to try the alternative R-12 stuff like
enviro-safe-12   ( http://autorefrigerants.com/co00033.htm ).  I presume I
need a vacuum pump to get rid of moisture.  I have plenty of air compressor
capability and was looking at the cheap air/vacuum pumps.  And I presume I
need a gauge set too.   Do I need anything else to do this job right?    My
200q20v needs recharging, I believe.  I think I need the gauges to check
that the R12 has disappeared???    My two V8s also have old R12 systems.
They work well now, but so has the 200 in the past.