[e90AW335i]

Step 1: Put a tee in the vacuum line going to the diverter valves. I put mine before they split but you can put it on either diverter valve as well. Once you put the Tee insert the thin line that goes to the gauge. Put zip-ties on both...





Step 2: Remove the cover underneath the driver side dash (above your feet) and poke a hole through this unused spot.





Step 3: Run the line from the engine bay into the cabin using a hanger or something that is rigid and easy to work with...







Step 4: Pop open the cover on the side of the dash, you should see it when you open the door. This will show you where to run the line that goes to the gauge...





Step 5: Use a piece of wire and run from the top of the dash down through the side part of the dash. Connect the small line with a piece of tape and fish it back up to the top of the dash. (no pics, sorry)