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Link g4+ piggyback

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Hi guys ,which is the correct way of wiring link ecu as piggyback? 

Spliting the signals from the factory ecu to the piggyback or cutting the connection between the factory ecu and connecting the needed wires directly to the piggyback?.


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It's up to you to decide based on whatever it is you're trying to achieve, and what you want each ecu to do, or how active/functional you need the OEM ecu to remain.


In general, 2 wire sensors/triggers cannot be shared


3 wire powered sensors can usually share a signal.

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