I would guess that you have some wiring issues if you get these two at the same time...
Not sure, got to see and check the grounds on main relay, gauge assembly, bulbs, I think 15A fuse under the hood that is responsible for ELD and VTEC oil pressure switch for the other code that might need replacing.
It could be many different things and have to check them step by step... A Helms manual would really be helpful to you at this time, there is just too much to go through, have to test all of this, could be as simple as replacing a sensor or fuse but could be a more serious problem.
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