Duane:
The A103-001 Totalizer costs $107.96 including shipping (unidirectional models cost much less)and can be ordered from:
http://www.veeder-rootcounters.com/content.aspx?id=66
If you do not have a magnet and sensor, one can be ordered for $14 shipping free from:
http://ecom1.planetbike.com/8000_1.html
The Totalizer can be used immediately as a reliable revolution counter by simply conecting the leads from the sensor to terminals 1 and 3.