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I don't know if you should splice there, maybe at the o2 sensor but not at the ECU, Something could go wrong.....
That's where all my friends tap into theirs right at the sensor (Black wire) on the first o2 Sensor works fine.
 

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^^ i also tapped the Black wire on the first o2 sensor, works fine for me...
 

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If you don't want the leds to bounce around, hook it up to the gray wire.
 
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