Rywire Motorsports Electronics : Home Rywire Motorsport Electronics specializes in wire-tuck (tucked), high performance, Mil-Spec engine harnesses. Rywire Brake Tuck, Clutch lines and Custom Radiators are popular as well. We sell & troubleshoot AEM, Hondata, Chipped ECU's, AIM Sports and MOTEC equipment.B-Series Harness · Engine Harnesses · D-Series Harnesses · K-Series Harness Rywire : Budget D & B-series Tucked Engine Harness OBD1 Budget D & B-Series Tucked Engine harness MADE IN THE U.S.A. This harness uses Mil-Spec Teflon coated wire with a maximum heat rating of 200°C. Our D-series and B-series compatible wire-tuck engine harness is nearly identical to our Mil-spec engine harness line with the primary difference being, the single black wire color and expandable loom.