57 Belvedere fuel gauge and sender accuracy

Before I put the new gas tank in I temporarily hooked up what looks to be original sender from where the wire plugs to it under the car and of course grounded it and turned on the key and watched the gauge work from empty to full and around halfway while moving the float arm. I also checked the cork float in a bucket of water and it stood right on top of the water. I figured that's close enough to tell me it has "some" buoyancy. (I know gas is different but by how much?)
Well I installed...


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