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I've looked into alarms too and agree it is a good idea. For 123 cars with mechanical gauges, you could tee the plastic line to the gauge and add a sender behind the instrument cluster, wired to a lamp or buzzer, whatever you want. I have thought about using a hi-brightness flashing LED. There are several spots in the cluster where such a lamp could be placed.
The only problem I've spotted so far is that all of the oil pressure switches I've seen so far make contact with pressure and I want it the other way 'round. That can be fixed with a little bit of electronics, of course, just like a tach signal can be used to activate a loud buzzer, but adds to the complexity.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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