DUMB MECHANICAL OIL PRESSURE GAUGE QUESTION

1971 CY Dodge Dart said
I used a plastic line when I installed my oil pressure gauge a few years ago but switched to a braided line shortly after. With the plastic line the gauge worked fine. After switching to the braided line my gauge bounces around all the time now and doesn’t give a solid reading. Anyone have an idea why?
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It could be that the hose is leaking at one of the fittings, for -3 and -4 there should be olives in the fitting. We pressure test all of the braided hoses we assemble. We use -3 for brake lines on the race cars and once in a while we have an issue with the olive not sealing right.