Red and Blue > 12V +
Red > from ignition sw 12V +
White > Lights on / radio buzzer
Grey and Blue > Lights on 12V +
White and Blue > Speedometer (vol increases with velocity)
According to this wiring there's a wire that sends a signal to the radio when the door is opened, ignition off - the white.
I'm not sure of, but give it a try
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