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I have an aftermarket mechanical oil pressure gauge under the dash on my car. It is fed by a straight copper tube. When the engine is idling, the needle bounces all over the place. I have another oil-filled gauge under the hood that registers 70 psi, with no bouncing. Do I need to put a couple of loops in the copper tube, to nullify the bouncing needle? If so, closer to the engine, or to the gauge? Should I buy an oil-filled gauge to replace this one under the dash? Thanks in advance for your input