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If you have not fixed the leaks (original hoses, o-rings, maybe the compressor, replace the drier, adding a low/high pressure switch) then recharging is not worth the effort.
But..... what you would need is an ac vacuum pump, service gauges and the procedures. If you want to insure you don't have leaks along the way, then you would need refrigerant oil dye, a black light and more preferred is a an electronic leak detector.
If you intent is a 'one time try to DIY' you may find it less costly to simply have a repair shop handle it.
Otherwise there are dozens of threads here in Pelican discussing the procedure as well as the obstacles and solutions (does not make sense to re-post the same info over and over again).
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