kahall82 Posted October 12, 2014 Share Posted October 12, 2014 Hi all,Have just put an 18spd Eaton into an R Model Mack but now need to hook up speedo. It has 4 wires coming from gearbox and is magnetic inside. It has three wires coming from the engine bay. We have another Mack that has a gear driven speedo. Any advice is welcome! Quote Link to comment Share on other sites More sharing options...
Timmyb Posted October 14, 2014 Share Posted October 14, 2014 Was your R model originally an electronic speedo? Most 18sp eaton I've seen use speed sensors and an electronic speedo. Quote Link to comment Share on other sites More sharing options...
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