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@ugosantalucia
It's very clear... the number you read on the gauge is the spoke deflection, which depending on the spoke diameter in the section you are squeezing corresponds to a certain spoke tension (in your case it's 1.8 mm).
As a rule of thumb you should aim for 100 Kg F (1000 N) for a front wheel and 120 KgF for a rear drive side. Most rims will be happy with that tension, some will take a bit more, some will take a bit less... The "tension until it bends and then back up" method no longer works, it belongs to the dark ages of rims made of cheese, ignore it. Modern rims will not bend until you reach crazy numbers (I have seen Archetype built at 170 KgF and being perfectly straight) and at those numbers the rim hole will crack very quickly.