Engine alarms are common on marine engines, even small diesel gen sets, so I would call a marine supply. A guy I worked for had a wife that had blown up two cars because of loosing oil pressure. He found an alarm system for the next car. After all he had them on his tugboat engines.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"