Originally Posted by Kev

Switch off Engine Run switch, switch OFF Key switch.

1/ Press both SELECT & RESET buttons and then switch ON Key switch, keep SELECT & RESET buttons pressed for at least 8 seconds. Display then changes to "DIAG". Release SELECT & RESET buttons.

2/ Press the SELECT button once until CO displays, press SELECT & RESET buttons again & hold, CO1 should display.

3/ Once selected CO1, switch on the kill switch & crank the motor. Once started the rev counter should be in the right side of the LCD screen.