Speedometer gear question

Here is an e-bay link if it helps.
[ame="http://www.ebay.com/itm/151184850553?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT"]http://www.ebay.com/itm/151184850553?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT[/ame]