Gas Guage Prob's

[79Betty]

I have a 78/79 k10, A 1/2 ton lwb. I had to buy a new gas tank and also got a new sending unit, got it in n wired up good... But my gas guage won't go below a half a tank. This is my 2nd guage as my first one wouldn't sit still, it just bounced from E to F every time i hit a bump. Is my 2nd guage bad as well? I'm going to run after market guages in my bezel but until then i need a good one. Do any aftermarket's (prefferbly equies so it matches) make a guage that will work woth our sending units? Thanks
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