Correct spelling for the English word "impressgang" is [ɪmpɹˈɛsɡaŋ], [ɪmpɹˈɛsɡaŋ], [ɪ_m_p_ɹ_ˈɛ_s_ɡ_a_ŋ] (IPA phonetic alphabet).
A party of men formerly employed forcibly to seize men as seamen for ships of war-usually written press-gang; proof-impression, an early copy taken from an engraved plate, a lithographic stone, and the like.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.