Amazon: evinrude wiring harness Amazon: evinrude wiring harness. Skip to main content. Evinrude/Johnson/OMC New OEM Instrument Tach Wiring Harness 174732, 0174732. 4.7 out of 5 stars 5. $47 $ 47. 93. FREE Shipping. Only 2 left in stock - order soon. 22 Circuit Universal Street Rod Wiring Harness System Check Tachometer harness? - communityrude The tiller wiring harness has a 6 pin connector for system check at the tiller arm, but most of the System check tachs have the 8 pin. The 6 pin appears to have the 4 tan warning light wires, gray tach wire, and black ground wire. It appears that I need to capture the purple switched power somewhere. Does Evinrude make a harness for this setup?