Most of the oil pressure switches I’ve seen switch at really low pressure like 3-4 PSI. They won’t activate until the oil pickup starts pulling air. By then the damage is probably done. In the example of a busted sump, a level light will give you a much earlier heads up, as there will be several quarts still left, and system oil pressure has not likely yet been affected, when it illuminates. I’ll take a level light first all day every day.
Sent from my iPhone using Tapatalk Pro