I have made a few button boxes and this was the easiest and cheapest one yet. Cost was around $30 and I was able to build it in under 1 hour.
I saw a great post on Reddit where a fella made a pull cord for his air horn. I had to give it a go.
I love Truck Sims. I mainly play ats and ets2.
I absolutely love American Truck Simulator. Check out my channel I make videos on SCS content and truck sim related mods and projects.