Drakson Colina

Ok so I bought this car and it had the low oil light with the gauge not working I replaced the sensor with an (after market one) then realised my gauge was bad so i bought a new gauge as well and still the gauge was marking low oil pressure and the light was still on I researched and figured it might be the oil pump or galley gaskets I went ahead and did both of them and im still having the same problem i dont know what else to do exept to buy a new oem oil pressure sending sensor and throw in there. Any help would be appreciated thanks.