Suzuki DF 25 Service Manual page 50

(5) Connect the tachometer lead wires as follows:
34200-92E02 : Engine tachometer
• Yellow lead wire to the Yellow/Black lead wire of CDI unit.
• Gray lead wire to DC 12V power source positive terminal.
• Black lead wire to DC 12V power source negative terminal.
• Set the pole selection switch in the tachometer to "12".
(6) Start the engine and warm up engine as follow :
Summer : 5 min. at 2000 r/min.
Winter : 10 min. at 2000 r/min.
(7) After warming up, shift into forward gear and increase the
engine speed to 3000 r/min. then compare the pressure
indicated on the gauge to specifications.
(8) After testing, reinstall oil pressure switch (See page 3-19).
PERIODIC MAINTENANCE 2-23
Yellow / Black
Gray
Tachometer
CDI unit
Yellow
Black
12V
Battery