As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED DURING TAKEOFF RIGHT N3 GAUGE BECAME ERRATIC WITH ALL OTHER RIGHT ENGINE GAUGES NORMAL. ALSO HAD RIGHT ENGINE BLEED "OFF" LIGHT, RIGHT CENTER FUEL PUMP PRESS LIGHT AND RIGHT ENGINE SPEED CARD STATUS MESSAGE DISPLAYED. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED TACHOMETER GENERATOR. SYSTEM GROUND CHECK NORMAL OPERATION.