The DRSP-1 plugs into the Dyna FS ignition module to enable the use of the 4 pre-programmed ignition advance curves as well as make fuel adjustments. There are 4 base fuel settings and the ability to adjust the airfuel ratio up to plus 20% or minus 17.5% in 3 rpm ranges. This wide range of adjustment will allow the user to tune for a wide variety of modifications. For advanced tuners the Curvemaker programming software and cable are included with the DRSP-1. Curvemaker will enable to user to access the advanced timing and accessory functions of the Dyna FS.