Everything should work. Just make sure that the plugs the back of your cluster match the plugs on the back of that one. Don't worry about the economy gauge, its just a vacuum line and if you don't hook it up it will just read 0 all the time. Or you could take the cluster even further apart and use your good fuel/oil/water temp gauge, the speedo/odo from the new cluster and the new tach/clock as well.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE