The indicator stalk won't have any bearing on it, they are exactly the same anyways.

You have to be careful when testing electronics, for example you can easily damage the injector drivers if you use a random bulb.

Additionally, you mention you have blown fuses, which would mean you have been causing shorts when testing.

As to testing the injector, remove the connector and plug both probes into it, being careful to ensure the two do not touch, which would cause a short. You need it running to do this.

You are correct in that the ECU will be an L6, so provided you get another one you can use your EPROM.

Martin