fuel gauge problems

My bet would be a bad wiper arm contact on the sender. You might even be able to fix it. You may be aware, repop senders are very inaccurate. There was a thread on here about improving them, and there is a device you can buy called a "metermatch" that is programmable and several different points to correct the reading. I have not used one as such, but I did buy one, set it up and do some testing.
I'll look into these suggestions as soon as I get the chance. I don't know if I mentioned though, The gauge was working fine for a two or three months before going dead. I don't know if that means anything or not. But it seems like it would rule out bad connections where the wire attaches to the sending unit. Although not necessarily. You would think all the taking it off and on would get it back if that was the case. I don't think I even drove from the last time I saw it working to the time I noticed it wasn't, so if something came loose inside, I don't know how. I need to drive it long enough that there isn't going to be a high enough level of fuel to spill out when I take the unit out, if it comes to that. It probably will eventually.