Heres the final result.
Step1: open steering 2 pedals set and cut the green wire and plug a 3 wires cable into the + - and green (clutch wire)
Step2: on a 10k potentiometer plug in order (+ green -) on pot.
Step3: lock the Hydraulic Handbrake axis and glue the pot on it.
Step4: on FM7 or FH4 switch clutch axis into Handbrake
Step5: adjust and/or invert the rotation and lock the pot in place.