After your strings are tuned to pitch, check the tuning on the fretted note on the twelfth fret. If the fretted note is sharp, it is necessary to make the playable string longer by turning the screw at the base of the bridge clockwise. Then re-tune the open note to pitch, and start again. Make sure that the string is coming off of the saddle is straight and not in an arch. After you finish that, go over every step again until the intonation is correct at all points.