Solved with a Meter Match Fuel Tank Sending Unit/Fuel Float Adjustmet

Hello Members. I need some help on my 65 Dart fuel tank Float/fuel gauge/fuel tank sending unit adjustment. I know that the tank was at, or near, empty when I put nine gallons in the tank. The tank's capacity is right around eighteen gallons, so the gauge should show half full. I have a new sending unit installed in the tank, and the gauge shows just under a quarter tank. Can the float be adjusted, or the sending unit be calibrated differently than what the manufacturer has done? I have installed a new IVR-4 voltage limiter, from Real Time Engineering, for the gauges, and the old voltage limiter in the gas gauge has been disabled. Thanks for any help on this. sgrip65