Fuel gauge sender Ohms

I checked the archives and all I could find is
what looks like later info.  I have a bugeye and
would like to know the ohms for an empty fuel tank.

It reads 78 Ohms full.  I was hoping someone new
what the proper range is.  I would love to drive 
it to empty, but it is not yet registered and that 
is a lot of trips back and forth on my driveway.  

Thanks,
Dan Mullis
http://www.ncal.verio.com/~djames/car.html