Avionics/Radios

Garmin G600 PFD  
Copilot HSI Sandel SN3500
Garmin 530W NAV/COM/GPS  
Standby Gyro L3 Comunication 520-1B
Garmin 430W NAV/COM/GPS  
Radar Altimeter King KRA-405
Audio Panel Garmin GMA340  
Altitude Selector Bendix/King KAS-297A
TCAS Bendix KMH-820  
Air Data Computer King KDC380
Dual Transponder Bendix/King KXP-756  
Interfase Adaptador Garmin GAD-43
Stormscope BF Goodrich WX-500  
ELT 406 Kannad
ADF Bendix/King KDF-806  
Davtron Chronometer M877
DME Bendix/King KMD-706  
TAWS, GPWS  
Weather Radar Antenna Bendix/King ART-2000  
Multifunctional Display Bendix/King KMD-540
Standby Altimeter Bendix/King KEA-346 
Computer A/P King KAC-325

Original source:
https://www.avfoil.com/aircraft/1982-ac-840-gulfstream-commander/