They have them. Back in the late 70s my Boss sold Murphy Switch Gauges. The you could set the gauge and an alarm would go off afterwhich you had 30 seconds before it shut off the Engines; you had that much time to get off the road.
They were hard to sell as Truck Drivers did not want to loose control of there vehicle.
Imagine yourself fully loaded going down a winding Moutain Road with a 400 foot cliff on one side and your alarm goes (could be high temp or low oil pressure) off and you have 30 seconds to find some place safe. The next place to pull off safely could be a long way from where you are.

Big stationary Engines have automatic shutdown switches because often there is no one around to shut one down if there was a prblem.
I would imagine the same situation with Marine Engines; no one to stand and watch a gauge 24 hours a day.

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84 300D, 82 Volvo 244Gl Diesel

You can use the glow plug relay signal to bypass the engine shut off vacuum solenoid (tee-ed into the IP vacuum shutoff). You can also use the glow plug relay signal to bypass the beeper during glow plug cycle.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

EXCELLENTE, Can you show us a electrical diagram wiring?. Also if we can use the same type of switch the DIESEL911 is using on his project.

I had the same experience with a petrol w108. Oil pump shaft sheared when my daughter was driving the car and I had to find a new (second hand)engine. She failed to notice the loss of oil pressure and she is an engineer. In retrospect I wonder if the failure was related to the use of a 50 multigrade oil (to control oil consumption). Andrew

50 weight oil is pretty thick, especially when it is stone cold.

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)