That's another hurdle then. With the HP24 I got part of cooler pipes cut in the middle. May be I can weld them to existing cooler pipes of HP22.Kapilla,
Sorry can't help with the torque wrench. Looks like you are nearly there but one or two other things have sprung to mind with the conversion.
First is fairly obvious, use your original diesel gearbox ECU, not the petrol one. Also the screw fitting on the end of the oil cooler pipes where it screws into the gearbox are a different size, HP24 vs HP22. It needs a thread adapter making up. I have the size written down in my notes somewhere. Guessing from memory it is 18mm/22mm ? You will be carrying on using the diesel gearbox oil cooler.
If you measure the gearbox and the end of the pipes you will see the difference in sizes.