Near Intersection of I-35 & I-90 Southern Mn. | I think it is possible and maybe quite easy. I did something somewhat similar with my Deere 8310R. It is obviously a different model and probably older so my procedure possibly doesn't apply to your situation.
My 8310R came from the factory without a Deere GPS nor a Deere radar gun. I had an Ag Leader Incommand installed as well as an Ag Leader GPS 6500. The InCommand is used for steering, seed monitoring, seed section clutches, spray control, fertilizer monitoring and downforce.
I thought it would be useful to have PerCent slip displayed. Without a true speed source such as a Deere GPS or radar the display would just show "----" for the PerCent slip.
As you mention my GPS 6500 wiring harness has a speed out branch. My installer made an adapter extension so the 2 pin speed out branch could be plugged into the Deere tractor wiring where a Deere radar would be plugged in. On my tractor this is below the muffler. As you mention there is a connector for GPS (meaning Deere GPS) or radar (meaning a real radar gun) under the power strip in your tractor. You plug in one or the other. My installer used the connector tagged radar. By using that choice. the output from the Ag Leader GPS 6500 rather than a real radar gun would be the speed source.
This was all that was required of the wiring. I did need to type in a special code into the InCommand that informed the GPS 6500 that I wanted to use the GPS speed out branch and how it should behave. The code was typed in once and saved. If an update was done to the GPS firmware then it was sometimes necessary to enter the code again.
Later I traded the GPS 6500 in towards an Ag Leader GPS 7500 with the Terra Star Pro C unlock. I expected that I would need to type in the special code again for speed out but it was not necessary as it worked fine. Possibly the GPS 7500 defaults to speed out ON. If it does not, entering the special code is a simple process.
This means that I have PerCent slip on my corner post. It is comparing the transmission speed against the radar speed (actually GPS speed from the 7500) and displaying it as a PerCent. I also have transmission speed and radar speed (actually from the GPS) available. If I see a radar icon, I know that is actual or GPS speed.
In all honesty this works fine but it is not terribly useful for our purposes. Would I do it again? Probably since the only added expense was a homemade adapter to connect the speed out branch to the tractor.
You ask if you could just make an adapter to go from the Ag Leader Speed Out branch to the speed in branch under the power strip. My thinking is yes since I believe it would be equivalent to what was done on my tractor. Actually it might be easier.
Fortunately information such as speed and flow are often just "shorting" pulses so even if a mistake is made, it doesn't work properly, but no permanent damage is done. I'd try it.
Edited by tedbear 2/10/2026 09:43
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GPS speed to wheel slip in 7R
