Problems with Saveiro 1.6 year 2013

Friends, I tell you; I change a soveiro 1.6 Saveiro Saveiro packaging (the same engine as the Golf I think), and it turns out that when riding, all good, but when heating, the oil pressure light ignites. I need to know if someone else has happened to him, since it is a first time something like that happens to me. The oil pressure bulb changes it, and the problem persists. How a history, change packaging why it broke and the water was passed to the cylinders.

That, I hope you can help me. Greetings

You should start by checking the oil pressure where the oil bulb goes
if the hot pressure drops, check the pump strain, it is not being covered with dirt and if that is not that changes the oil pump.
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