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a few things. engine oil tends to mean a mechanical failure could be loss of oil or a fracture or loose fitting. If your drive belts are all intact and your oil level is close to normal start looking at battery wring and then remove air filter and inspect.
If your driving and the tachometer needle slams to zero that normally means an electrical failure.
If your driving and the tachometer needle drops in stages to towrd zero that usually means something like interrupted fuel delivery - diesel fuel is usually more dirty so filter inspection is more frequent ?
I see this is your first post but the subject is a good one.
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