I did mine, and if I hadn't lent my gauge to my friend who lost it, I'd lend it to you! Take the splitter off your portafilter, you may need a screwdriver horizontally through it to twist it off. Go to the hardware store, and find a pressure gauge that goes to at least 12 bar, and you may need a coupler/adapter. I used a 90 degree one, and it threads on your portafilter. It cost me about $15 total. I got it at Rona. There are guides online for the rest of it. Works great.
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