Depends what is out of adjustment. Sender range should be 10 to 73 Ohm. The gauge and voltage regulator are calibrated on production. The VR has an adjustment screw to produce a voltage output and the gauge has 2 adjustments, one for the range and one for the zero position. All are very delicate adjustments! I figure that empty is the important end of the fuel gauge reading and I live with a not quite full reading.