You can connect the GNS range to the standard lighting rheostat in the aircraft or set as auto dim. Or both.
Yes, thanks, I've already tried it both ways as I do a lot of night work at this time of year. Auto dim is far too bright, enough to instantly ruin night vision. Allied to the lighting rheostat makes it unreadably dim. Either way I have to adjust it manually and then adjust it further as it gets darker. I will be seeking engineer's advice to see if they can adjust the brightness response to the cockpit lighting rheostat.