Reading Oil pressure gauge on 90 Nissan 300ZX

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How do you read the oil pressure gauge on on 90 Nissan 300zx ?
  what is a good reading ?
   what is a low reading ?
   what is a not so good reading, and when should you read it ?
   what do you readings actually mean ?
  Thanks..

--
Etop Udoh     sdruid111@yahoo.com     http://www.geocities.com/sdruid11

Re: Reading Oil pressure gauge on 90 Nissan 300ZX
wrote:

Quoted text here. Click to load it

I don't have a '90 300zx in front of me at the moment, but most
engineers design gauges so that "normal" is at the halfway point. A
little high or low is OK, but a big variation is cause for concern.

Low oil pressure readings can mean a worm engine or a weak oil pump.
High ratings can mean clogged passages in the engine. All this
assuming you've changed the oil relatively recently and put in a
proper filter.

There may also be more specific things a 300zx gauge tells you - for
example, a reading that varies significantly with engines RPM
indicates wear - but what specific wear is typical in that motor would
be better found by seeking out a web forum specific to Z cars.

Re: Reading Oil pressure gauge on 90 Nissan 300ZX
wrote:

Quoted text here. Click to load it

I don't have a '90 300zx in front of me at the moment, but most
engineers design gauges so that "normal" is at the halfway point. A
little high or low is OK, but a big variation is cause for concern.

Low oil pressure readings can mean a worm engine or a weak oil pump.
High ratings can mean clogged passages in the engine. All this
assuming you've changed the oil relatively recently and put in a
proper filter.

There may also be more specific things a 300zx gauge tells you - for
example, a reading that varies significantly with engines RPM
indicates wear - but what specific wear is typical in that motor would
be better found by seeking out a web forum specific to Z cars.