For engines with an electrical oil pressure gauge it should be possible to use a simple transistor switch that looks at the gauge circuit and turns on an alarm. It could be adjustable so that it wouldn't go off with the drop in oil pressure of a hot idling engine. It would be nice if the alarm didn't go off when the engine was not running. Perhaps a cut-out circuit using the alternator light could be added. A fail-safe design would really be nice but that is hard to do. let me think about it.

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