A tachometer (revolution-counter, Tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine.

Switch off the killswitch
Press and hold select & reset
Turn on the ignition, while pressing and holding select & reset
Hold it for 8 seconds
Hello DIAG mode :)
Press select till CO appears
Then press select & reset till co1 appears.
Switch on the killswitch and start the engine.
Hello Digital RPM mode :)

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