If the RID goes blank then it points to something that is a total ignition loss. Either ignition switch or wires (goes with you fitting the bar risers?), side stand switch, or kill switch.
Had the same on my GS and it was a botched repair to an ignition switch (less than £20 from one of the usual). Also with a K100 which just needed the contacts cleaning at the bottom of the ignition barrel. Also had clean or repair issues with the side stand and the kill switches on BM's.
As this is the more usual GS thing, then the switch/switch wires to the loom would be the 1st to check. As with many of these wiring things, remove cable ties and "wiggle" wires to check for breaks. Same with kill switch and sidestand switch. If you work the switches slowly you can check for duff or intermittent connections.