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Simple to do yourself, just make sure the gauges go on a HP port and the second stages go on a LP port. Pretty easy to tell which is which, most are marked but just look in the port, if there is a TINY hole in the back it's a HP port, anything else is a LP port.
Now here is the difficult, important tech stuff: If you like you can lube the orings with a little silicone grease or spit does OK. Start the hoses BY HAND and keep going BY HAND until they snug up. This should be very easy to do, any resistance indicates something is wrong and you need to find out what. Then with the proper sized wrench SNUG them a little. No need for more than a good snugging, if you need more than a couple of fingers on the wrench your tighting them too much. The O-ring does the sealing, if you have a leak, it's an Oring or mating surface problem, tightening the connection more will not help and may cause damage.
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