Hey Pat.
I’m just not so sure the oil pressure sensor is responsible for the “turns over but won’t start” aspect.
I’d suggest a more direct strategy to diagnose the no start issue, first. Ensure you’ve got fuel pressure, see if the spark is being generated and transmitted, etc. There are a number of things that could be your problem, I just don’t think the OPS is one of them.
Over time and miles, normal wear increases clearances between lubricated internal parts (bearings, journals, etc.), thus the oil flows more freely, and with ''less pressure.'' So it’s no surprise if your gauge indicates low oil pressure, once that engine has logged some serious miles. Perhaps the sending gauge/sensor is ok, and your actual oil pressure is just really low (engine is worn).
Maintaining the right oil level would be a good idea, and if the sensor/gauge worries you, remove the sensor and temporarily install an oil pressure test gauge, and check your actual oil pressure. When you remove the test gauge you can opt to install a plug in the port where the sensor was installed, and forget about it.
Happy to look into more specifics regarding the “no start”, if you want. Just provide information on your engine.
Good Luck.