Hey,
Thanks for the compliments on my site. Its always a work in progress.
Anyway, you don't really need a tool to remove the needles, and they should be removed for any face modification. It prevents them or the whole assembly from being broken or recalibrated improperly.
To fix the offset, measure the distance in your mind between where the needle is now, and where you want it to be. Then remove the cluster, and unplug it and everything. Remove the black bezel and the clear plastic cover. Watch the needles sag. When the tach needle hits its 'bottom' push it until it gets firm (maybe just a few degrees). Now push it farther the distance you measured in your mind earlier. You are now calibrating the needle to a lower speed. Never push the needle clockwise. Always counterclockwise. So if you overshoot, spin it all the way around again.
Seth
P.S. I don't want to make you nervous here, but anyway...Just be careful with the tach since its a weighted magnet. If you push to far it will automatically 'flop' over. If this happends you'll know what I mean. Don't worry, just keep going, and then 'flop' it back the other direction. Because your offset is so small, this shouldn't happen.