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Yep... the oil pressure switch is a pressure sensitive variable resistor. At normal oil pressure the resistance is high enough to stop a regular globe from turning on, but led's turn on at a much lower voltage.
Adding one or more silicon diodes (or a Zener diode) in series with the LED should allow it to go out completely.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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