Try this....
Button A=r/h
Button B=l/h
OIL- oil service.
Press and hold button A
switch ign ON
release button A
the letters"oil" will appear in the trip display
turn button B to the right untill "----" is displayed
INSP-inspection service.
Press and hold button A
switch ign ON
release button A
press and release button A
the letters "insp" will appear in the trip display
turn button B to the right untill "----" is displayed
If required, clear the "oil" indicator from the display as above.
Hope this helps, Steve.
(time for a beer

)