Fuel/Ignition Controller Wiring Harnesses | AEM AEM F/IC harnesses include a bypass harness and 24" flying lead harness. Please click on the EMS Accessories link to find a USB comms cable. NOTE: F/IC units include a wiring harness. The harnesses listed here and on the purchase tab are for replacement only and are not necessary if you are purchasing a new F/IC. Wiring Harnesses | AEM Fuel/Ignition Controller Wiring Harnesses. Digital to Analog Gauge Wiring Conversion. AEM Side Menu Products. Products. CD Digital Dash Displays & Adapter Harnesses; AEM INFORMATION. Warranty/Return. Become a Dealer. Dealer Locator. About AEM Electronics. Contact Us. Career Opportunities. Sponsorship. New Products.