Is a more accurate Fuel Sender available for the Mobius?

The gauge fluxuates by 1/4 tank the whole time we're riding, and the gauge is reading at least a 1/4 tank lower than it actually is at all times. So the gauge reads between 1/4 and 1/2 tank lower than it actually is at all times (except the first 15 minutes of riding when it reads Full).

I read where a lot of drivers just estimate based on how far off it is, but I imagine there should be a more accurate sender than this.