"FF: I still have a low oil alarm that is attached to the ignition switch. It sounds when I turn on the ignition and when I shut down the engine."
That will let you know when the oil pressure is below 5PSI or whatever it was set for.
A Murphy Gauge will allow you to set your gauge to any setting , so if you normally see 40PSI cruising you can set the gauge to say 35PSI and not wipe the engine at cruise RPM.
They make mechanical temperature alarm gauges too.
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