white knight - you'll have to do what richeich is doing to recalibrate. Did you mark the position of the needles (normally) before you started the install? If you marked normal operating temp, then the temp needle is an easy fix, as for the tach, you'll probably have to "turn" it back down 4500rpms so that it'll "zero"
Again, fuel go and fill up then set it back @ full so that you know that's a good reference.