as far as the mileage is concerned just note current miles on bike. Miles on new cluster and keep it handy. This way if you ever sell it you can tell what the real miles are. Another thing you can do is check with your dealer to see if they can have the miles reset to match what is on the bike. When I worked on cars and they needed a new speedo we took down the miles on the car and ordered a new cluster to match. You may be able to get it set up to be right for your bike.
Oh and how's the new house treating you?