The only way to check is to connect a good mechanical gauge into the hole the oil sending unit is in. You only need about 5psi at idle. You need over 30 psi at 4500 rpm. Usually you will have above 15 at idle and over 40 at high rpm.
There are a few things that can give you the low pressure light. A bad connection, a sending unit failing, a gauge failing, oil levels wrong in the engine (too low or much too high), or an engine getting set to fail.
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