The top oil pressure bar on my digi dash has started to flicker on and off even when the engine is running at 4000rpm. Two things have occured to me:
1) the oil pressure might be dropping slightly due to a worn oil pump (engine has done 155K).
2) the pressure sensor would appreciate being cleaned out and any wiring connections checked.
Now I'm hoping that 2) will cure the problem, but what's the chance that the pressure is actually falling.