Dynatek Dynatune Kit for Harley Davidson All models (exc. 2011-13 Softail, 2012 The DynaTune kit monitors the fuel mixture (by installing the included Wide Band O2 sensor(s) in the exhaust) It then sends this information to the Dynatek Control Module (either the Dynatek 3000 or Dyna FS Fuel and Ignition modules) and automatically corrects it as you ride, letting you feel the changes as they happen. Each map that Dynatek offers has preset Air/Fuel ratio target values included that have been found to be the best overall settings. This lets you simply plug in the unit and let it do the work