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[cam.in.head]

Exactly .im not 100% sure but I think the oil pressure switch turns the light off at anything above 0.5 bar. So this means that your engine could be running all day long at 0.6 bar and you wouldn't know. It's a pity most cars don't have a gauge on the dash .(fitting aftermarket gauges always looks tacky to me.)this would also tell you of a stuck relief valve sending the pressure up through the roof at higher revs.

[BazaJT]

The Senators always had an oil pressure gauge,I never did understand why GM deleted this from the Omega.

[cam.in.head]

I know. Going back to senator era vauxhallls,all normal spec cars got a fuel and temp guage and all higher spec stuff always got an oil pressure and a voltmeter.viva,cav,manta,carlton,senator.i have been trying to work out if i could fit my guage somewhere on my omega but to make it look stock.i bought an instrument cluster to experiment with.not come to any satisfactory way yet !

[Kevin Wood]

The Senators always had an oil pressure gauge,I never did understand why GM deleted this from the Omega.

Probably because the average seat-steering wheel interface didn't have a clue what it was telling them and those who didn't completely ignore it would fret about it reading higher on a cold morning than after a good spanking on a hot day.

Same reason car manufacturers are now either removing temperature gauges in favour of a warning light or engineering in a large "dead zone" so the gauge doesn't move over the normal range of operating temperature.

Not saying it's right, just a symptom of what a car manufacturer has to deal with.