Starting with the current steering wheel positioned straight forward, rotate it to the max each way and see where the final position is left to right. If it is turning farther one way than the other, figure the difference and see if the corrected position adjusts out on the tie rods. Your steering wheel will now be positioned turning left or right with the tires straight. If it does correct once you make the adjustments, either pull the wheel or adjust the splines from the shaft at the rack to re-center the wheel. If you make the adjustment at the rack, remember to pull the bolt totally out or the shaft will not come off the rack. If you make the adjustments at the wheel, look to see if the blinker cancel cam is in the correct position. It should be to the left centered on the blinker once the wheel and tires are positioned straight. This will most likely not re-align the steering perfect so you will need to tweak the tie rods one final time but it will be very close.
Hope this helps.