Canadian 1991 accord exr-alb - oil pressure warning light intermittantly flashes on & off (like a signal dash light). oil up to full line - add-on oil pressure gauge shows 40-50 psi while driving down highway with a fully heated engine. "occasionally", hi-beam dash light doesn't work, cruise dash light doesn't dim when headlights turned on and/or left signal directional dash light doesn't flash. what's up?

SOURCE: DRL and High Beam do not work right on Honda Accord EX 1998

Some time back I found some data on a similar website suggesting that the Day Light Running circuit board, just under the steering column, developed cracks in some of the soldered joints. Your high beams should also be affected with loss of day light running lights.
Resoldering repaired the continuity of the circuits. Ours is now working quite reliably. Some of the defective areas developed slight brownish discoloration, that's how I was told to recognise the areas to be resoldered. Hope this will help you solve your problem.

SOURCE: Oil Pressure Warning light

Sounds like possiblity of the oil pump being bad, and is setting off other sensors on your car.

SOURCE: 1991 accord exr is shaking erractively

MY DAUGHTER HAD THE SAME PROBLEM. THERE IS A HOSE THAT GOES FROM THE VALVE COVER TO THE FUEL INJECTOR HOUSING. ITS ABOUT 12 INCHES LONG. THERE WAS A TINY LITTLE TEAR ON THE BOTTOM THAT I COULDNT SEE. I REPLACED IT WITH FUEL LINE TUBING THAT I BOUGHT FROM AUTOZONE. IT WORK PERFECT. I HOPE THIS IS YOUR PROBLEM. IT TOOK ABOUT 2 MINUTES TO FIX.

SOURCE: Flashing D4 light & speedometer stopped working

could be speed sensor. the light is on because the trans doenst know the vehicle speed.