Same design mate, but nothing aircraft related , Dial face is 3 1/2 " ( 9CM ) Diameter and body depth 1 1/2 " (4cm)
Lightweight construction , designed for some panel face. They are precision made instruments
Interesting to note that they bear the British maker's stamp on the lower face. They must have been made in the UK for the RAAF, and not made out here under license like some other things, the MK. 111A gunsight for example.
I've seen some photos on the net of the same type of gauges on ground based radio sets, so radio equipment would be my guess. Nice gauges. Good RAAF stuff is a bit hard to come by these days.