Oil pressure warning light stays on for 10 mins

I have looked at many of the oil pressure threads but none seem to have my particular symptom.



My oil light flickered for a day or 2 and now it comes on at start up but goes after about 10 mins. I think this is the point when the engine is fully warm...



So far I have done an oil and filter change. Took out the pressure sender and put it back in again (cause I have the wrong one).



Most people with oil pressure problems there light comes on when the oil is up to temp and thin.



I will fit a new correct pressure sensor this weekend (the only time I have to work at the car) but what else could I look at before loosing another week.



Cheers

from the last news http://ift.tt/1KNvHTM

via IFTTT