Fuel gauge will not read full.

After I installed a new fuel pump and sending unit, my fuel guage will only go to 7/8 full. The original sending unit when the car was brand new would send the fuel guage well passed the full line?
Any help or suggesting would be grealty appreciated.
Its a XE v-6 70k

This happened to me with 40 miles on the odometer it was a bad Fuel Sending Unit. I have since found out that these are porely made, my guess is your new one is no good.

There is an adjustment that can be made at the sender to position the resistor board in relation to the float arm:

http://mywebpages.comcast.net/xterra/tech/SenderAdjust.jpg

I've never tinkered with it, but if you look on the right side of the photo you will see the "toothed" edge of a cam mechanism that pushes the resistor board down or lets it move up. There is a plastic "spring" at the other end of the board that puts tension on it. You can fiddle with that if you really want to mess around with it.

Brent