Instrument connections

[jotech50]

Bit of a long shot but this seemed as good a place as any to start looking. I am building an R22 simulator and where possible would like to use modified real instruments. I have an old Carb temp gauge which has an AMPHENOL 4 pin connector, can someone advise me as to what each connection is? and the input signal values/voltages?
Manufactured by AIRCRFT INST & DEVELOPMENT INC, has a date stamp of FEB 5 1970.
Any help much appreciated.