We repaired the sensor switch, and now it's back on and the correct gear is shown on the dash when moving through the gears. Unfortunately I still can't get it to run as some other error is preventing operation. There is a constant alert sound that starts a little while after turning the ignition and doesn't stop until turning off. By the way the back wheel is still off and the car is on stands at the back.
Dash errors now, the EPS and airbag lights go out after a while: