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Only a few sets of gauges needed when I start at the beginning of a busy season. Its the same every year, fix my gauges at the end of the year when its slow in Demcember , new hoses, valve, pistons, diaphragms, orings, seals, knobs, gauge heads. start with all new gauges By the end of the next summer I'm left with 3 or 4 good working gauges. when you do almost 2000 a/c services a year it realy wears on the tools. The cheap china manifold gauges sets just dont last even one season! Most of the time with even new cheap china gauges can't even pull down to 500 microns (garbage!!!). TEST your gauges at lest three ways, there are more but i'll keep it simple. #1: Pull a vacuum over night below 500 microns. HOLD IT OVER NIGHT 24 HOURS!!. It should not even lose less then 1-PSI. Ideal is it my raise to 3000 microns because of a little moisture and gas traped in the hose linning. Do this every week or at lest once a month, if it fails find it and fix it. #2: Next with out opening your gauges to the atmosphere you'v just spent 24 hours vacuuming. Pressurize them with dry nitrogen to 150-PSI over night. After 24 hours you should not even have lost 1-PSI!!! if you did find it and fix it. #3: This one is bad for diagnosing A/C. Refrigerant bypassing valves, seals, pistons, diaphragms, between high and low ports or low to charging port or high to chargingports. I'v seen TECH's over charge, under charge and burn up compressors because of this many times and they don't even know what happen ?. I'm only telling you part of the story there are many other possibilities I did not explain, (SORRY). 10/29/11