The 1986 Chevrolet Cavalier oil pressure sending unit can be found on the left-hand side of the engine. The oil pressure sending unit will be above the oil pan.
Top rear of engine, close to the distributor.
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With a 4.3L engine, the oil pressure sending unit is in the back of the engine just to the drivers side of the distributor.
There isn't one.
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There isn't one.
It is in the fuel tank.
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Simply put....Yes
It needs a tune-up.