What was found
AT APPROX 0800 CST AT, TAXIED ACFT TO RUNWAY 12R FOR DEPARTURE. CREW SET THRUST ON ENGS & NOTICED NO N1 INDICATION ON NR 1 ENG. ALL OTHER INDICATIONS WERE NORMAL. ABORTED TAKEOFF & NOTIFIED TOWER IT WAS DUE TO GAUGE MALFUNCTION. TAXIED ACFT BACK TO CHOCKS WITH NO FURTHER ISSUES. DISCOVERED THE NR 1 ENG N1 INDICATOR HAD AN INTERNAL FAILURE. THE FAULTY INDICATOR, PN 2117034-10, SN LH-447, WAS R & R WITH A SERVICEABLE UNIT. ACFT WAS RETURNED TO SERVICE.