1985boat shevrolet 350 oil presher guage peged.replased sending unit
Twin skrew 350 port side fine starbord side oil presure guage pegs to 80 psi uper helm to lower helm changed sending unit shecked contanewity witer 12 volts ground sender wires .same voltage as other side that works .bought new guage bout new sender .if i unplug the sender gauge goes behind zero ,polarity ?
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it sounds like your oil pressure sending unit may be plugged by whatever took your pressure down to 5-8 psi the first time. this is extremely low pressure as i am sure you know but at 30 psi your light should go off i would replace the sending unit if your oil pressure is holding 30