i did away with any kind of flare fittings, i hooked up to system like normally would. Pull a vacuum for about 20 minutes then close off valves disconnect high side attach it to micron gauge then open high side let pull down then the low side. need to pull it down to 3 to 4 hundred micons. When you close the gauges down micons will rise basically want it to stabalize around 800 micons if it goes above 1200 need to keep pulling may be moisture left above 1500 theres probably a leak. The supco vg64 should be cleaned about every other time. trouble shooter from supco explained the reason for the rise is that the gauge is alot more sensative than most others. the other ones usually move at higher incraments.if any one needs further information they said they could fax it.