WELCOME - I do not like the new style large manometers from Wilesco.
For a D405 you have to remove the whistle and place a manometer with M 5 thread.
I would recomend to search one with a diameter not more than 20 mm.
for ex.
https://holzapfeldampf.ch/produkt/manometer/19 mm 0-4 bar M5. Swiss Francs 58.00
Arnold
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