[Wildstreak]

I have a cummins swapped k30 crew cab and recently my tank started leaking so I got a new tank and a diesel sending unit for the driver side. The problem I have is the new diesel sending unit has a ground wire attached to nothing in it and I have no idea where it goes because the old gas unit does not have the same wiring. Anyone have any idea where it should go? I dont like the idea of a wire just lose in the tank. and info would be greatly appreciated!