From my experience the air vacuum type doesn't screw onto a set of auto gauges but does a home style gauge so it's not much good for auto without some rigging but things may have changed.
If the system has lots of metal shavings in it the system will need to be flushed or the metal will end up in the new compressor causing damage and stopping up orifice tube filter every few months. Depending on how much metal is floating around. This will cause increased head pressure. Which means shorter compressor life, less cooling and a little increase in the power it takes to turn the compressor. You will find yourself having to change the stopped up orifice tube atleast once a year.
You will need a set of gauges. That's a must. You can't use the cheap fill kit because you need to pull vacuum from both the high and low side.
I second the idea of taking it to a good shop and having it done right. You can do it yourself but chances are you'll miss something and have problems again next year. I don't know what a shop will charge but you will need to speed a good $200 to get the tools you need( vacuum pump, gauges, can tap).
Last edited by tomtom52; 08-22-2015 at 10:20 AM.