Evinrude Wiring Harness Diagram | Wiring Diagram Evinrude Tachometer Wiring | Best Wiring Library β Evinrude Wiring Harness Diagram. Wiring Diagram comes with several easy to adhere to Wiring Diagram Guidelines. Itβs meant to help all the typical consumer in building a proper method. These guidelines will Evinrude/Johnson/OMC New OEM Instrument Tach Wiring Product description. Brand new, genuine OEM Evinrude / Johnson / OMC Tachometer and Guage Plug-In wiring harness and connector kit, part number 174732. This is a factory original part, not aftermarket. Plug in to 1995 and earlier controls provides plug-in capability for 4.7/5(5) 2008 etec 115 system check tach wire harness - E-NATION The wire the trim hooks up to gauge with is an easy fix becyuase it's just three individual wires so I can lenghten them, no problem. I need to get a tach extension and everything that I seem to see online is a 6 pin harness extension. The tach and wire harness that I am working with are 8 pin. Is it possible to buy an 8 pin tach extension? Thanks, Evinrude at Amazon - Low Prices on Evinrude AdCheck Out our Selection & Order Now. Free UK Delivery on Eligible Orders!Amazon Kindle · Prime Same Day Shipping · Today's Deals · Gift Cards