Help Connecting Fuel Sending Unit

Installing new sending unit while I have my tank removed. The old one was in pieces in the bottom of the tank. PO has installed gauges for water temp, oil pressure and voltage output. Everything but one lamp and speedometer cable has been disconnected from the instrument cluster. I have located the sending unit wire and need to connect it back to the proper terminal. I think there should be a wire from my ignition switch to the instrument cluster but it has been removed also. Can anyone help me with the termination points for the sending unit wire and power source connection? I have provided a picture of the back of the instrument cluster. I know the sending wire connects to one of the group of three behind the fuel gauge but which one?
Thanks for any input.

 

Gauge Repair Information

Good timing I had it open in another tab

 

Just what I needed!
Thanks Jw60!