Weird electrical problems

[innoi]

I have to issues first my hazard lights flash bizare. It's not a steady flash pattern, very inconsistent and fast then slow. Second my fuel gauge has not worked since I bought my truck. But after I unplugged the wire that ran from
The gas tank to the fuse box it pegged full. But when it's utter in it pegs empty. Oh yeah and I forgot to mention that I had to pull the hazard fuse to get them to stop. Any suggestions on any of this.
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