Black and Walsh (1989) say Gudang and 'Andooyomo' (or 'Ndoodomo') Y192 are often grouped under the name Djagaraga Y6, and these are not Uradhi dialects. They list Gudang under Northern Pama.
Dixon (2007 p.c.) groups Gudang and Djagara Y6 together on the basis of their locations.
There is a word list by Jardine in Curr (1886).
Occupied the littoral from Cliff Head (north of Newcastle Bay) to Cape York (Shanahan 1897:44). The Gudang people possess the immediate vicinity of the Cape (MacGillivray 1852).
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).