Same Problem here:
no way to set manifold pressure higher than 30'
Description on instrument (red outlined markers on surface of gauge) means
D = Dauerbetrieb means permanent allowed pressure (1.25 Ata)
30' = Steigleistung 30 minutes max pressure (1.3 Ata)
1-2 = Start und Kampfleistung one to two minutes (1.4 plus Ata)
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