Oil light flashes in Diesel Pole 2006

Hello beautiful people from the forum.
I have a problem with a diesel pole with mechanical injection and electronic board model 2006
when it heats flashes the oil light.
They had touched it a lot and left the cables as a disaster.
Manage to restore the original electrical installation.
I put a new oil bulb thinking that it was that and no, follow the eyebrows of the light.
This tab occurs when accelerating at 2000 rpm.
I discovered that the sensor that sends signal to the board temperature meter seems to be the problem.
When unplugged, stops marking the temperature and stops blinking the light.
This is how the preheater works, with the sensor disconnected.
Buy a new one, the same color, but the problem follows.
Will anyone have any idea what could be?

Muvhas thank you.

On this problem, it ends tired more than 10 years ago and the conclusion that I took out is that it was not from the sensor, mine has been around for more than 10 years, annul Pressing oil monitoring, and they fail in the same ... well, if you find out something new, let us know, already out of curiosity ... greetings !!

That car carries a control module that covers the oil, pre -timer, and a/a, is on the fuses, is the largest of all, I do not remember the number, I think it is 104, but I am not sure.
It is quite expensive, but it is very possible that this is your problem