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It might be ECM failure, since it doesn't appear to be related to just one sensor. Another possibility is that the whole instrumentation panel needs to be removed and replaced. Probably more than what you want to get involved with. I'd recommend taking it to a Honda dealer.
With ignition ON, check voltage on both test points on under-dash ACG(S) fuse No. 24. If there is no voltage going through the ACG(S) fuse, test/replace the ignition switch and harness going to the under-dash fuse/relay box.