This module is designed to speed up the signal from your shaft speed sensors after doing a gear reduction. Specifically this model is plug and play on 2004 to Current 650 and 680 Rincons with the Big Red Gear Reduction (BRGR Kit). Custom Programming can be special ordered for other gear reductions. It can be used on the Honda 420i as well but as a solder in design. Also a different part number for $225 Canadain We are working on a design for the Honda Pioneer 1000s as well.