Fuel Tank Sending Unit

[red70]

I have been trying for the last few hours to find out whats wrong with my sending unit. I am puzzled as to how the wire that goes from the sending unit to the fuse block attaches to the little brass plug on the sending unit itself. Can someone tell me where to get this little thing at because I thought there was a stud and a nut on it but it seems like a press on fitting. Also the tank is an underbed mount blazer mount poly mount tank.

Thanks

Byce