The ECU mounts in the stock location for the RSX/Integra and EP Civic.
It is easiest to plug the USB cable into the ECU before you install the ECU as the USB connector is hidden once the ECU is install into some vehicles. Take care not to place any strain on the USB connector and the circuit board inside the ECU.
Take care not to short the metal shield around the USB connector to the ECU case or chassis ground. It is not necessary to ground the case of the ECU.
Immobilizer
If the immobilizer light on the dash blinks (green key symbol) then you may to re-enable the immobilizer.
If the ECU does not match and vehicle (key and immobilizer transponder) then it is possible to disable the flashing immobilizer symbol simply by unplugging the immobilizer transponder (located on the ignition switch barrel).