I agree that the orange light is a bit bright but have not ridden the Z'ed in the dark to really know how 'bad' it is.
I also run a GPS but at the moment I have taken a fused lead connected directly to the battery which I use for my heated jacket. This is a standard Gerbing part but I have made a splitter which goes to a cigarette female socket which I use for the GPS. This works well, looks a bit shabby, but I just wanted to get going. I intend to add a relay soon as I do not like the idea of a constantly live output on the battery. I will look for a terminal that I can activate a relay that only becomes live when the ignition is on in a few days time after this weeken. Thumper club Annual Rally!
My last bike was a DR750 and I used a similar system to power a GPS, heated grips and the jacket, I think the relay was suitable for 30 amps.
PS bike is now getting bedded in and I'm using the revs more freely now, I can confirm that 113 on the speedo is 101 on the gps, sitting up!
True 70mph on the GPS is reading 78 on the bike speedo, not very accurate if you ask me but easier to keep your license if you keep to the speedo!
Oh and check small screws around the bike I seem to be loosing a few and the welding on the bent wire that holds the sidestand spring has come away already, not very good penetration of the actual weld, but I'll do this properly myself.