NL now has their TSC control and monitoring units, and can probably be retrofit into the genset. It provides basic engine parameter, and basic AC parameters, and exports it on J1939 which in turn can be connected to N2K. That would be one way to get what you want, though probably pretty expensive all in.
But even with the TSC, their shutdown protection is an all or nothing proposition, and provides no direct indication which sensor caused the shutdown.
Short of the TSC, you could instrument the engine using a variety of maretron sensors. Pressure for oil, and temp probes for coolant and maybe exhaust elbow temp. I don't thing EGT is needed since you can't really overload the engine given the breakers on it. If you already have the maretron modules, adding sensors can be very economical. But if you don't have them already, it too can get expensive fast.
Last you could use one of the various analog engine data to N2K converter devices. I've never tried one, and can't say I've read very enthusiastic reports on any of them.
I've been running with their 4 gauge panel (Temp, oil pressure, hours, battery volts), as are pretty much all other Nordhavns with no real issues.