I have the Auto switch in my SE 2012 Passat and the non auto switch in my 17 plate Transporter Shuttle SE.
I noticed that the dash lights brighten up in bright sunshine and then dims under cover, shade, cloudy etc. So I assumed that there must be a sensor in the dash somewhere. In my Passat it's in the rear mirror mounting,
I just changed the Auto switch from the Passat for the T6 and as it's now dark, the auto light switch works. The wife is not pleased as the Passat is in her name ....
I did look at the difference in the pins on the rear as the non auto switch has one less pin, but the lights came on when in auto.
I'll have to test in the daylight but it looks ok so far.
Dave C