'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Trek's web site, under "Equipment and Accessories" has discriptions of all of their cyclometers and each one has a tab for Instruction Manual. See if you can find yours or one like it. I think Trek's are made by Cat-Eye (the earlier ones were) so their web site is another possibility.