Fuel Gauge Problem

hi everyone!
I have a 72 Duster,225 Slant 6 pretty much stock and my fuel gauge dosent work.I checked it for voltage with a test light and noticed with the key on,the light on the test light blinks and then the fuel gauge starts to work but then when I take the test light off,the gauge fails to work again.So I figured the gauge actually works but must be a bad ground so I checked under the car and noticed a wire sticking out from one of the fuel lines next to the fuel tank.Is this the fuel gauge sending unit ground?If so where does it connect to because I cannot for the life of me find where it connects to.Thanks everyone.O:)
Author: admin