car is actually an 89 but selection list doesn't go back to that 2.2L CARB eng. on 1990 Honda Accord

Occasionally , when cold or hot , the oil, battery lights flicker very briefly and the chime for key in ignition will ding simultaniously with lights. Oil level good, pressure tested @ 17-20PSI @ idle. Honda online info doesn't go back this far anymore(dealership-sad) Anybody have wiring info on this to see if there is a common ground that could be faulty? It has up-graded (recall) ignition switch in it and I've checked that for burnt contacts -looks OK. ?help?

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