Anyone have experience removing the terminals from the harness connectors at the guage cluster or the ECU?

Use a jeweler`s screwdriver to release the lock tabs.

So.... I have had good luck removing pins on connectors throughout the car. However, on this connector (green) I released the strain clip (bail on the wiring side of the connector, part of the connector) but the terminals are so small and access rather tight, I have been unable to locate the lock tab on the terminal itself.