there is a technical bulletin MSB 03-015 by Yanmar tell you how to set the tachmeter . for 4JH4TE, you have to set the pulse / rev in the meter at 10.29/rev. The procedure : there is a small opening at the low sided at the back of the meter covered by a paper label. use a wooden stick to press the tiny button inside , hold it and turn on the switch. you will hear the alarm
and in the LED panel , you see the alternating ADJUST or PULSE in the display panel every 2 second . when the PULSE shows up, release the button, something like P 14.50 appears , The last digit will flashes, Then you have to change this digital to 10.29. begin by pushing the button by the wooden stick to change the flashing digit. Stop pushing the button once the pulse count is correct. Like P 10.29. the setting is completed .