As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACCEPTANCE INSPECTION OF NEW CESSNA WITH 8.0 HOURS SINCE MANUFACTURE REVEALED THE TACHOMETER WAS IN ERROR. A CALIBRATED TACHOMETER TESTER INDICATED THE AIRCRAFT TACHOMETER WAS 25 RPM'S LOW AT TAKEOFF AND 75 RPM'S LOW AT IDLE. A REPLACEMENT TACHOMETER IS BEING INSTALLED.