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Ecu ground cable

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When connecting a sensor output to ecu say link, why would you also run a ground. Seen this on the video on road tunning and don’t fully understand the concept of ground wire on ecu

You are probably referring to sensor ground.

It is plugged this way because the voltage (+5v) is supplied by the ECU. We want to make sure there are no ground offset that could "affect" the signal. This could happen if we plug a sensor ground the the chassis, which is normally used with +12v.

These sensor grounds are usually for critical sensors like TPS, MAP, IAT, CLT...