Thanks a lot for this. I was able to solve it thanks to your help.
sen=chunk.sensors[1]
location_vect=me.Vector((0.1198,0,0))
rotation_vect=me.Vector((-0.376965,-0.00629332,-0.209045))
location_accuracy_vect=me.Vector((0.003,0.003,0.003))
#These 2 options in GUI: Slave Offset -> switch off "Adjust location/rotation"
sen.fixed_location = False
sen.fixed_rotation = False
ref = sen.reference
ref.enabled = True
ref.location_enabled = True
ref.rotation_enabled = True
ref.location = location_vect
ref.rotation = rotation_vect
ref.location_accuracy = location_accuracy_vect
ref.rotation_accuracy = location_accuracy_vect
#sen.location = location_vect
#sen.rotation = rotation_vect
I ended up with this after some modification to fit my script. Last 2 lines seems to be unecessary.