This indicator was found in a garage in France. It appears to be rather recent (60's ?) .
And the question is : on which type of aircraft was it fitted ?
Thanks for your help.
Gilles
IMHO it is the Thomas Edison Tri-Temperature Indicator for 24V.
The "G" means 'Gauche' - left and the "D" - 'Droite' - right. The "GAUCH." and "PROF." seem to be the abbreviations rather. But Geo can be right.
However it could be used for a small aircraft judging by the temperature range.
So an instrument that might be fitted into a number if different aircraft types of cockpit configurations, most likely a twin engine and as was pointed out left / right oil temperature and fuel temperature maybe at a header tank?