1973 Jeep Commando, 1966-1973 Jeep Wagoneer, 1966-1973 J series truck. Number 12 in the diagram. This part is one of the main reasons your gas and temperature gauge does not work.
Other instrument cluster parts were stock
Circuit board 938657 # 2 in the diagram
Lamp 936653 # 4 in the diagram
Lamp socket 936654 # 5 in the diagram
Bezel 941804 # 17 in the diagram
Cluster plug 933695 #2 in the 2nd diagram