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First off, you need to get over to nico and snag a virtual fsm for your car so you can just look at the wiring schematics. Second, your lights all run through a separate wiring harness. The ECU is an Engine Control Unit, and the wires from that only control powertain-related components. Lights, wipers, horn, blinkers, etc all run through a series of relays, switches, and fuses. So no, ecu is irrelevant for those items to function.
I can't help you with the speedo/tach wiring, however. Although, for the speedo, you can buy a little module to intercept the signal and correct it. essentially it's a little gain knob, so you can turn it up or down to increase/decrease the speed signal so that it's accurate on the dash.
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