installing tach

hey guys.. how hard would be be to install a gauge cluster from like an LS impala to mine, with all the goodies (like the tach, ect) ?

i have a 2002 impala, base.

ALso, how would i reset the mileage, if i have to change the whole cluster out?

thanks

acually.. forget that, how hard would it be to install this:

http://cgi.ebay.com/ebaymotors/2000-CHEVROLET-IMPALA-00-no-TACH-REVERSE-GLOW-GAUGES_W0QQitemZ8010545885QQcategoryZ43952QQrdZ1QQ cmdZViewItem

ewwwww you wont get the tach with that installing the cluster with a tach is simple remove the old one and install the new one takes less then a hour and milage wise there are companies out there that will prgram your milage into the new dash but if it's less you scored lol just remember the milage on the old one and your seti happen to know a guy that can reprogram the milage on them but he charges like 300.00