How did this thread get de-railed to sharing opinions about fastener theory ?

I'm concerned about determining how the low oil level warning system operates. I replaced my oil level sensor, and tried to test it by filling up the oil sump, and with the ignition to ON draining it all out. The warning never came on once, leaving me wondering what happened. And how I can bench-test my old sensor to determine if it's working as I kept it.

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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.