Originally Posted by Jack370Z

It really is simple once you get the hang of it...here is the info from the Owners Manual:


Setting
Setting cannot be made while driving. A
message “Setting can only be operated
when stopped” is also displayed on the
vehicle information display.
The switch *A and switch *B are
used in the setting mode to select and decide a
menu.
SKIP:
Push the switch *A to move to the
warning check mode.
Push the switch*B to select other menus.
ALERT:
Alert menu can be set to notify the following
items.
. UPSHIFT
Select this submenu to set the engine speed
(RPM) of the upshift indicator. (See “Upshift
indicator (if so equipped for Manual Transmission
models)” in the “5. Starting and
driving” section.)


Just use the "B" button and scroll up or down to the RPM you want the lite to activate...I think the default is 7000.