Toyota Corona 2001 (oil meter light)

Hello friends, I have problems with the orange oil meter light that turns on randomly, you could tell me where the sensor is located or some article with the explodes, thank you very much !!!!

I have not found a scheme but it goes in the motor block only a clable comes, and it is very delicate has a very fine thread and so much as to take it out and it puts it to be very careful, the safest thing is that you have ostrured it the best thing to change it.