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Checking Riello pump pressure

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So when I do maintenance on oil appliances I check pump pressure. Beckett burners I'm very comfortable with, but whenever I see a Riello I dread it. I understand (for the most part) how they work and what not, but for the life of me I cant figure out how to check pump pressure. Im guessing I need a metric to MPT adapter and remove the bleeder port? God forbid theres any useful manual that explains this. The pump gauge im using is qwik check II (see photo attached).

What do I need to check pressure? I'll attach another picture of what I believe may work, but I need help from someone who has a similar scenario. Thanks guys.