2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 65Get this manual
Engine General Information and Diagnosis:
Operating Hour Indication System Description
When the ignition switch is initially turned "ON" (from "OFF"), the ECM tests the caution system by turning on all four lamps in the monitor-tachometer and sounding the caution buzzer for an initial two secondsFor the next three seconds, the ECM indicates the total operating hours, using combination of the tachometer needle and "REV-LIMIT" lamp flashNOTE The total operating hours displayed are those of the actual engine operation, not the ignition switch "ON" timeMonitor-Tachometer