http://www.ducati.com/bikes/tech.jhtml

MAIN TORQUE FIGURES - ENGINE
Thread x
pitch (mm) Nm ± 5% Notes
Head nuts, 2V engines (approach/final) 10 x 1.5 15 / 30 /38 Grease RETINAX - LX 2
Head nuts, 4V engines (approach/final) 10x1.5 15 / 30 / 51 Grease RETINAX - LX 2
Timing ring nuts (head / transmission) 15x1 71/61 Use new ring nuts
Flywheel / alternator nut 20x1 186 Engine oil
Crankshaft gear nut 22x1 186
Clutch nut 20x1 186 Grease RETINAX - HDX 2
Timing transmission gear nut 14x1 45
Spark plugs 12x1.25 20
Oil plug 22x1.5 45
Oil cartridge filter no. 44440034A 16x1.5 16
Oil mesh filter 22x1.5 45

I don't think oil sensor nut is on there, but if you're talking about the oil temp sensor, it breaks very easily with too much torque but i don't know the spec...