Technical Fuel Injector Torque setting.

[Gromett]

For a Fiat Ducato 2.8JTD 2003

My new Fuel Injector arrived today and I am planning to fit it tomorrow. I have just realised I don't know what torque to tighten it back down to...

I obviously don't want to tighten it too much or too little so I thought I would ask on here...

Thanks again.