1997 gmc yukon 5.7 gas gage going nuts

[_Spanish_]

So i recently had to get the fuel pump replaces and ever since, the gas gage goes up when i accelerate and down when i break (the harder i accelerate or break the farther it rises or drops) and also when i fill it up completely i notice it doesn't move untill i use about 1/4 of the tank at which point the needle will go to about 3/4 and start moving up and down as i explained earlier. Ofcorse if i park downhill the needle will show me having less gas then i actually have and if i park uphill itll tell me i jave more but if i park or stop in a leveled road itll tell me the actual amount of gas i have. Now this isn't a slow moving thing it happens very quickly.

I imagine that the float on the fuel pump was places in the wrong direction than it should go maybe?

Thank you all for your help in advance.