73 Dodge Dart Sport Fuel Gauge Wiring

RedFish, you've been very helpful. Thank you. That's my issue, when I look up under the dash all I see is the screw studs sticking out of the back of the fuel gauge, and it looks like this also for the voltage meter and temperature guage, but they are working? I thought the wires were connected to the back on the studs? Is the wiring up inside somewhere. I don't know how they are working? These cars are suppose to be simple right? I have another quetsion about following the fuel gauge sending unit wire...