If the display function does not work, replace the meter unit.

Check 3-6: Neutral Indicator Light (LED) Inspection
Meter Unit Circuit (ZX1000J Model)Self-Diagnosis Procedures
NOTE
Use a fully charged battery when conducting
self-diagnosis. Otherwise, the light (LED) and symbol
do not light or blink.
Turn the ignition switch to ON.
When a problem occurs with DFI system and ignition system,
the warning indicator light (LED) [A] goes on and
FI warning symbol ...
For Primary Fuel Injectors
Remove the air cleaner housing (see Air Cleaner Housing
Removal).
Disconnect the injector connector and connect the harness
adapter [A] between these connectors as shown in
the figure.
Main Harness [B]
Primary Fuel Injector #1 [C]
Special Tool - Measuring Adapter: 57001-1700
...
Trip Meters
The trip meter has two meters which
distinguished between the “TRIP A”
and “TRIP B”. The trip meter shows
the distance in kilometers or miles traveled
since it was last reset to zero.
TRIP A: 0.0 9999.9
TRIP B: 0.0 9999.9
A. Trip Meter
B. “TRIP A”
To reset the trip meter:
...