The 1" 6-32 screws arrived from Aircraft Spruce (ordered some epoxy too) so I installed them, four washers on each screw to attach the GPU plug to the bracket. I moved the groundwire to the other side of the overflow bottle which is much better tested it out. Still a little weird with the G3X dimming when I turn on the avionics. Also when I turn on the master even though the battery isn't connected. I'll read up on things.