Need another gauge cluster

Hi guys and gals Anyone know where I can find a spare gauge cluster?? I had a few friends tell me is doesn't matter about the milliage because the computer is the unit that stores it so if thats the case the it should come up with the same milliage i have now. Please corect me if im worng but anyway the purpose of another cluster is I want to do the white face gauges and scared that I may screw something up and really be SOL. TIA