how to check the dash fuel gauge in 06 f350 6.0l on 2006 Ford F-350 Super Duty

i changed the float assembly that didn't seem to help unless i have the wrong one. tank could have 5 gals in it and read 1/2 full its 38 gal tank any help would be nice thank you larry

Asked by for the 2006 Ford F-350 Super Duty
dealer can run a test on instrument cluster to check dash gauge. can also check to see if any codes set for fuel sender or a wiring concern. they also have a resistor test unit to check fuel gauge in dash. sets different resistance to see if gauge moving to correct position.