I was doing a job down at Komatsu last week and saw an engine sitting on a stand just inside the workshop door. A brand new twin turbo common rail V12 diesel. I don't know how many litres or what horsepower but it was a 7 foot tall work of art. It had 4 pyro sensors all neatly mounted before the turbos with the wiring neatly run around the engine to a connector block. Like you said a far cry from the old mechanical diesels of years gone by.

Tony