What is it that does not work?
Do all the LEDs light besides the FI indicator?
When you turn the switch on, does the tach cycle during ECU self-test or is there no LCD display at all?
Have you to tried disconnecting/reconnecting the gauge connector to check for good electrical connection?
Have you also tried disconnecting/reconnecting the ECU connectors to ensure good electrical connection?
Also, if you short the green service connector and turn the ignition on, what ECU code is displayed by the FI indicator blink codes?
Since the fuses are presumed good, it could be gauge panel, electrical, or ECU related.
The ECU sends the display indicator information to the gauge panel.