Oil light driving me nuts

Joshstan

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Joined
Apr 16, 2014
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Portsmouth
Hi all my s3 has had the red oil light on since the day after I bought it I have tried everything
New pump and pickup
New sender
New oil and filter
Oil pressure test came back ok
I have tried unplugging the sender and still comes on
I have tried earthing the sender and still comes on
Could it be my instrument cluster at fault?
 
Aah I have heard of this but I thought the regulating valve was part of the pump?