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I have a 1987 300Z. While driving the gauge fluxuates from 40 to Zero sometimes. It appears the engine is fine and the oil level is full. Any ideas?
 

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either your oil pump is dying, or (more likely) the oil pressure sending unit is failing. I'd replace the sending unit first, its small, round, and screws into the block next to the oil filter.
 

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Yep, I agree with phxZ31 I think thats exactly what it is because that is a common Z31 problem the oil pressure sending unit!!
 

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mine was doing the same thing when i swapped my engine ,it was the oil pressure sensor,you have to take the starter off, it looks complictated but its not ,if you have a haynes manhual you will have no problems gettin it done.
 

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yes take the starter off or youll regret it...like me.
 
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