3000/4000 RPM Governor spring kit for your 1994, 1995, 1996, 1997, 1998 Dodge Cummins 12 Valve P7100! Great upgrade to allow the engine to rev higher and have better throttle response. Excellent upgrade for towing and daily driving. If you plan on revving past 3200 RPM, it is recommended you use our heavy duty valve springs as well.