S&S Cycle KIT, GUARDIAN DIAGNOSTIC 55-5075 UNIVERSAL The Guardian Diagnostic System offers engine builders and tuners some powerful new tools to use with the S&S IST Ignition module The Guardian Kit contains a software CD for PCs, a translator unit and 2 cables that connect the translator to the COM port of your PC and to the data link on the motorcycle wiring harness Once connection between the computer and IST module is made, the software allows access to new functions and diagnostic data Allows you to use a PC with a 9-pin COM port to perform the following functions: Turn On the Break-In Rev Limit function to protect a new or rebuilt engine during break-in