usmcbob

I have 02 IS300 and recently my dash cluster meshed up... I was just planning on replacing by buying another one with just about the same mileage on it from ebay but all the ones on ebay have way to many miles on them....So what should I do??? Someone told me that the mileage is actually stored in the computer on that car but I am not foresure so I dont want to buy a cluster that has allot of miles on it and then it show that on my car...So my question to you is...Is my Mileage Lost???? please help....thanks