Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

This '99 Corsa 1.2 16V oil pressure light is flickering at below 1200 revs when engine is warm.
Recently a mechanic mate and I changed the timing chain, fitted new oil pump & water pump, new big end bearings and cleaned out the sump. The damn oil pressure light is now coming on. Have tried 3 different oil pressure switches, but still the same.
Anyone any ideas?

when was the last time you changed the oil filter?

Oil changed after all above repairs carried out. Used 20W40 semi-synthetic.

you could try mounting an oil pressure gauge onto where your pressure fitting goes on and manually see what oil pressure your getting, i guess that would then give you a visual on what oil pressure you are running, therefore if it looks enough then i guess their shouldn't be a worry, what it could be is a bad connection somewhere, because everything you'v changed is what could / would be causing the oil light to come on, so apart from those things i dont know what else could be causing the light to show, what mileage is on the clock? what you could try doing is using a thicker oil to take up any clearances.

The cars done 99k. I try to change the oil March/April and Sept/Oct so I will change to a thicker oil. Perhaps a 20w50 will do ?