Ok chaps as we know a lot of WW2 aircraft had pneumatic controlled gun mechanisms, i've had this instrument knocking around in my collection for a while but i've never been able to find out what flavour aircraft it might of come out of. With the "Ontario Hughes Owens Co. ltd" its probably from a US aircraft.....but thats all I can deduce!
I'm prepared for someone to drop the bombshell that its actually just a gauge for a workshop airline for tools etc but.....it just looks like it should be mounted in a panel, what do you guys think?