As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABORTED TAKE-OFF DUE TO ROTOR TACH FAILURE. ROTOR NEEDLE DID NOT MOVE ON FIRST ENGINE START. UPON TROUBLESHOOTING, NR SPEED SYSTEM FOUND TRIPLE TACH R NEEDLE FAILS TO SELF-TEST, NEEDLE IS STUCK. REPLACED TRIPLE TACH INDICATOR IAW AMM 62-41-00, 4-2. MOC SUCCESSFULLY COMPLETED.