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R 685ST transmission swap/electric speedometer


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I did a transmission swap from a Mack 5 speed to a Eaton 8LL. In doing this I’m going from a mechanical drive speedo to electric. Wanting to know if anyone has a wiring diagram for speedo to sensor. 5 wires coming from speedometer to the 2 wires on sensor .

 

thanks

 

5CA39D59-B1EF-458E-8657-F548A5B10C02.jpeg

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  • 2 months later...
On 9/17/2021 at 7:01 AM, fastboater said:

I did a transmission swap from a Mack 5 speed to a Eaton 8LL. In doing this I’m going from a mechanical drive speedo to electric. Wanting to know if anyone has a wiring diagram for speedo to sensor. 5 wires coming from speedometer to the 2 wires on sensor .

 

thanks

 

5CA39D59-B1EF-458E-8657-F548A5B10C02.jpeg

I'm just throwing this out there...I restore vintage KW's. In two of my '78 A models, I went to a GPS driven speedometer from speedhut.com. They are fantastic in my opinion, because they don't care about component changes, tire sizes, or anything because they're satellite driven units. I LOVE them. And for around $280.00, they're less than OEM ones. Highly recommended for this exact type of deal.

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