An incorrectly fitted head gasket was my first thought but if you have no oil at the pressure sensor on the block that obviously isn't the problem. I don't know how the oil pump is driven on the petrol engine, possibly by the cam belt but it seems that its not being driven. You really need a manual for it, I expect Hains do one for not a lot of money.
The nearest manual I have is for a Xantia which may be a similar engine, on that the oil pump is driven by a chain which necessitates removing the sump.
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