HiRev 7500® Ignition Control UnitModern Electronics with Mopar OEM AppearanceComparable to Mopar Chrome Ignition Control Unit7,500 RPMMade in USA Installation Notes:Case must be grounded. Be sure mounting location (firewall, bracket, or fender apron) is free of rust & paint (sand or wire brush as required) before mounting Ignition Control Unit. Make sure the mounting screws are tight and use Serrated-head screws or external-tooth lock washers to mount the Ignition Control Unit. Coat connector pins with silicone grease. Be sure wiring connector retaining screw is present and snug.Plugs into all Mopar OEM, JEGS, and Mopar Performance wiring harnesses, whether the harness or vehicle was designed for 4 or 5-pin Ignition Control Units. No modifications required.Use with ballast resister. Works with 2-Pin or 4-Pin ballast resistors. Use without ballast resistor will destroy the Ignition Control Unit. Use with OEM or OEM-Spec (oil filled) ignition coil. E-Frame coils are also acceptable. High Performance Coil 555-40105 is also recommended. Coils made for C-D ignitions (MSD, etc) may destroy the Ignition Control Unit. Coil Primary resistance should be no lower than 1.4OPre-startup test (recommended for vehicles that has experienced Ignition Control Failure). Connect a voltmeter between the coil positive (+) and a good ground. Turn ignition key to "run" position. Voltmeter should read between 7.0 and 9.0 volts. If higher turn ignition key off immediately and check ballast resister (resistance - too low 0.5O minimum, 1.0O recommended for most street applications), ballast wiring, shorted coil, ignition switch wiring, etc.Quick Wiring Check - Disconnect either ballast connector at idle. Engine should stall instantly.