If you buy a copper tubing kit for guages, it is 1/8th inch and has the compression fittings (nuts and inserts) in the pack. It has a thinner wall thickness than regular 1/8th copper tubing for better response at the guage. Its cost is under $10 and well worth it. I have bought these from auto parts stores for both of my guages (boost and oil pressure) and have never had a problem with either.
Also, any hardwarre store will have the inserts. Ace, Home Depot, Lowes, Menards, etc. They all have them.
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