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

Check 3-6: Neutral Indicator Light (LED) Inspection
Meter Unit Circuit (ZX1000J Model)Wiring Diagram (Other than US, CA and CAL with KIBS Models)
ZX1000KC
ZX1000KD
...
IC Igniter Inspection
The IC igniter is built in the ECU [A].
Refer to the following items.
Interlock Operation Inspection (see Interlock Operation
Inspection)
Ignition System Troubleshooting (see Ignition System
section)
ECU Power Supply Inspection (see ECU Power Supply
Inspection in the Fuel System (D ...
Special Tools and Sealant
Oil Pressure Gauge, 10 kgf/cm²:
57001-164
Oil Pressure Gauge Adapter, PT3/8:
57001-1233
Outside Circlip Pliers:
57001-144
Liquid Gasket, TB1211:
56019-120
...