Don't throw that ECU away. Many components on it will be salvageable. It *might* even still work. But would need to check the ICs and capacitors that got the plasma blown towards them. At worst, it becomes a 'spares' ECU for motherboard level repair in the future. Is the Gen 3 loom not available? I am assuming you want to get a Gen 3 voltage sense harness, and an ECU? It is probably possibly to jerry-rig a Gen 2 loom into a Gen 3 one. It would require some work and wouldn't be particularly neat, but it would work at a push.