first, copy the files in the extracted folder into the folder of the truck you put it on.
then add the soundscript names under soundsources, like this:
Cummins 6BT sound. this is a better 12v cummins sound than the previous one i made.
works best with Box5s 1st gen, 2nd gen, 94 ram pack, and the f600 in stoats f series ford pack.
these are the soundsource names that you put in the truck file
UPDATE 5/17/21: Fixed errors and set the jake brakes to the horn instead of the brake and gave the jakes pitching. now you should be able to hear the jakes on multiplayer