Hi all, the oil pressure light on my dash starts to flicker at idle speed when the car has fully warmed up. If I lightly touch the throttle and up the revs to 1000 rpm the light stays off. Have changed the oil (went slightly heavier grade 20W/50, it is quite warm here in AUS summer you know and not as wet as the UK either) and this seemed to reduce the flickering somewhat but not eliminate it. Now I'm thinking, either dodgy oil pressure switch (which previous owner thought it was, as the engine has been reconditioned and maybe a 'different' oil pressure switch was installed at the time) or weak oil pump. Any experience out there with replacing oil pressure switches and/or oil pump checks/replacement?