This is a sound addon for the Roman Diesel by MADSter. It’s compatible for v 1.34. This download has two files , one includes dealer fix with sound file and another has only sound addon.
You can use the files as per your requirement, those who already have dealer fix they can use sound addon only scs, and those who don’t have dealer fix they can use sound inc dealer fix scs.
Whichever file you use, they must be kept at high priority (at the top) in mod manager.
LynxKris (Lynx’s Modding), SCS