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OK;
Only one wire from guage, runs to and is connected to fuel tank sender. Sender makes variable connection to ground (chassis of vehicle). Sender needs a good connection to tank, tank needs a good connection to chassis of vehicle.
For wiring diagram and color codes, see: http://www.intelab.com/swem/122S%20Wiring%20Diagram.jpg ...it looks like were talking about a Black wire.
To check guage: With IGN ON, ground wire which is connected to sender, fuel should read full...with wire disconnected from sender guage should read empty...or is it the other way around...I always forget...
Cheers
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