E90 ECM and flexfuel - which pin ?

I got a HPtuners unlocked ECM for a 2019 Silverado and are trying to figure out which pin in the ECM connectors that are for the flexfuel sensor. Anyone here that got the E90 connector pinouts or even better - which connector/pin for the flexfuel sensor?

It's no problem changing the tune to run only E85 or only petrol but it would be nice to use a flexfuel sensor so I don't have to change tune when changing fuel. There is support for this in the tune but which pin to connect ?