Davis Unified Ignition (D.U.I.) GM Computer Controlled Distributors offer a direct replacement for your GM computer controlled engine and plug directly into the factory wiring harness for an easy install. A Brass terminal cap and rotor provide maximum conductivity and insures durability and performance. Nylon rotor hold down screws are used to prevent high rpm misfires and each unit comes with oil impregnated brass bushings that are lubed for long lasting life. Available in 7-Pin Dyna-Module and 50,000 volt street/strip coil version and 8-Pin Dyna-Module remote coil version.