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the gauge is a good thing to have anyway if you have alittle $ to spend.
The way they are describing probably works as well.
Why do you need to know? If your pressure light is coming on when driving or flashing while driving you may be in a big hole. If it comes on every now and then when under 1k rpm or so, your oil pump is probably going bad, and if thats the case you need to fix it FAST.
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