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I don't think my response here is going be helpful, but the OEM unit is a switch not a sensor. It's a normally close switch. If it's in line with all the other engines I've come across from Subaru (which it looks to be), it triggers when oil pressure drops below 2.1psi. Which is great for telling you your engine just blew up :/ If you can make this work, I recommend setting an alarm or light to go on at 14psi, which is the FSM minimum allowable oil pressure.
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