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Update:
Took off the instrument cluster. Zip tied a barrier strip to the back of the cluster, and ran all the grounds and DC power distribution to it with ring terminals. There were 13 wires tied together for ground, and 7 wires for power. The wiring is much, much neater now.
The flakiness ended up being due to a 6-position connector, on the ground wire. Popped the pin out, cleaned it with contact cleaner, compressed the clamping edges, and reinstalled it. Reworking the instrument cluster wiring also fixed the tachometer, which was going wonky at over 6K rpms.
All the connectors have been backfilled with AS388 silicone, and I have started the process of attaching all the plastic back onto the bike. Tomorrow should be over 40 degrees, and I will probably take a spin around the block to check everything out. First I have to replace the seat bolts (which are bent) and the main fuseholder with a blade fuse.
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