Cowboy924

Upon closer inspection, the black pass through panel is marked at each location. Once I found the transducer marked “APP G” it was pretty easy to figure out which air line I needed. I double checked it using Nigel’s method. Its the black line pointed out in the picture below, in case anyone else needs to know. I’ll post more pics once I get it installed. Thank you both for your help!

Here’s a pic of the back of my instrument cluster. i don’t know which wires go to the brake pressure gauge. And even if I did I’m not sure I could keep track of which “white with an orange” stripe wire it is LOL! seriously though, I thought somebody on here must have already been through this and could point me in the right direction. Thanks, Luke

My applied pressure gauge is electric, no air line going to the back of it. That’s the first place I looked. Thanks

Hello! Long time lurker, first time posting. I’m trying to install a Hayes brake controller in my new to me 2012 Volvo VNM630. Which air line do I “T” into? I’m fairly mechanically able, but air brakes are new to me. I attached pics (I hope) of the air lines under the dash and under the hood. Any help would be greatly appreciated. Thanks, Luke