By Dakota Digital; Used to correct speedo when changing tires and/or drive ratio; Plug & Play; Plugs-in between speedo sensor end speedo. Module can correct speedometer to within 1 MPH from 50% to 200% of the original reading Fits: 96-06 B.T. (excl. 2006 Dyna); 96-06 XL (NU) Units: 1