You should not need to bleed the
oil line. The air will transfer the
oil pressure signal to the gauge. If you were to disconnect the fitting at the back of the gauge while the engine is running,
oil would pump out of the line...Thats why I said that if the line is full of oil, you have a leak in the fitting at the back of the gauge. I would think that you do not want oil to ever reach the gauge in a proper installation.
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