Hi
I am putting a 99 4.8 into a c10. I have HPtuner and I read to make the electric fans work I need to swap the OS to a 2002 12212156 OS. Can I save the tune, swap the OS and put the stock tune back and then enable the fans in it? since the engine is stock I expect minimal tuning needed. But if I have to swap in another tune I will need to manually copy all the tables from the stock tune in correct? I prefer scenario 1 if it is possible.
Thanks
Phil