Once the cluster is installed, the vacuum (MPG) gauge should fall to zero at a stop, and get completely buried on the other side at any acceleration or speed.
Like John said, it is possible to make the gauge functional for the ti, it just seemed like more hassle than it was worth to me.
Good luck! __________________ 
1995 318ti Base - Cosmosschwarz/Sandgrau R.I.P.
1997 318ti Active - Alpinweiß III/Sandgrau
2013 328i Coupe - Le Mans Blau |