What was found
ONCE THE #1 ENGINE WAS STARTED, NO NRO INDICATIONS. CALLED MAINTENANCE TO TROUBLESHOOT, RESET BAT AND GENERATORS FOR TROUBLESHOOTING. FOUND THAT AFTER START N2 NEEDLE INDICATED PROPERLY WHILE ROTOR TACH REMAINED AT ZERO. ADDITIONALLY, NR ON THE SYSTEM STATUS PAGE INDICATED ZERO. NOTE: NR/N2 INSTRUMENT DID CYCLE THROUGH FULL DEFLECTION AND BACK TO ZERO ON APPLICATION OF AIRCRAFT POWER. REPLACED SPEED PICKUP IAW: AMM 62-41-00, 4-1. MOC SUCCESSFULLY COMPLETED.