Probably due to this com issue for Nano clones: Arduino COM port issue
Note to future PCB makers: could those 2 pins be connected by default on the pcb!
And that way eliminate the problem for others.
In my setup, the pcb is powered with pin 11, so it has power always when tractor is on.
The little safety circuit that I’ve added is just a relay connected in series with the BTS output in pcb. This relays coil is powered with pin 6 in X716(witch has later been changed to pin 3 of the X 720). This allows me to be sure that the steer engage valve, controlled by BTS, is not going to get power if the column switch is off.
I have made a summary of everything you have commented:
It seems to me that it is clear to me that the pcb connects when turning the ignition key (pin 11 X716) but the orbitrol valve (6/2) only turns on when the switch of the rear column is activated, for which it can be taken the current from pin 3 of X720 and send it to 3168 of x710.
The was 3120 signal must be connected with a Y cable for the tractor ECU and for the navigation control, it is made in the connectors that are in the front part of the engine.
The signal from the pressure sensor (so that it disconnects the autoguidance when moving the steering wheel) 3160 is connected to the analog input of the arduino A0 (or A2 as published by Larsvest in an image in “AOG on Autosteer ready New Holland T6-175 year 2018” ) and no potentiometer or resistor needed for AOG V5, and it is set from AOG.
The pressure sensor must be supplied with + 5v from PCB to pin 29 on X716 (3167) and GND from PCB on pin 39 of X716 (3161)
I am not clear if the was also has to be fed from the PCB or is fed from another part of the tractor.
Thank you very much for all your teachings
I have made a summary of everything you have commented:
It seems to me that it is clear to me that the pcb connects when turning the ignition key (pin 11 X716) but the orbitrol valve (6/2) only turns on when the switch of the rear column is activated, for which it can be taken the current from pin 3 of X720 and send it to 3168 of x710.
Finnish farmer found the 3168 at the tractor ECU(see his photo, and find that connector under the small opening at right side by back window/behind your seat) but you can also use x710 connection as I did.
BUT the current from pin 3 is only activating a relay. which allows power from PCB4 to pass from the 6/2 system. You should not power 3168 directly from pin 3 of x720, because then the automatic on off for 6/2 valve does not work (6/2 output is only on when AOG autosteer is on/active)
The was 3120 signal must be connected with a Y cable for the tractor ECU and for the navigation control, it is made in the connectors that are in the front part of the engine.
Was can be done 2 ways: As I did, just stealing original signal(via Y connection) and still let tractor ecu feed the 5 V and GND.
Or as Finnish farmer feeding 5V and GND from PCB v4 ant giving only signal to tractor ecu (via Y connection) If you don´t give signal to tractor ecu, then you would not have automatic diff lock/unlock any more.
I use only one of the was wires in x716, and Finnish farmer use all 3 for was
The signal from the pressure sensor (so that it disconnects the autoguidance when moving the steering wheel) 3160 is connected to the analog input of the arduino A0 (or A2 as published by Larsvest in an image in “AOG on Autosteer ready New Holland T6-175 year 2018” ) and no potentiometer or resistor needed for AOG V5, and it is set from AOG.
Correct, except the info from me about A2 is no longer valid.
The pressure sensor must be supplied with + 5v from PCB to pin 29 on X716 (3167) and GND from PCB on pin 39 of X716 (3161)
I am not clear if the was also has to be fed from the PCB or is fed from another part of the tractor.
Thank you very much for all your teachings
I recommend doing as Finnish farmers, he has made the best solution, and I am going to make the same safety system for the CNH T6 -175, as he have for the 6/2 valve.
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Today i also received my connector for the built in harness, and started wiring my pcb.
I also stole the Pin 3168 from the Ecu, and my system is pretty much working, the only thing i’m not quite sure about is, should i add a extra button to trigger Steer on the Pcb, or did somebody find the connection to the Original Button from the tractor?
I did not even want to use the original steer button because it is positioned in odd place.
I have a foot switch on floor of the cad, wired under the floor mat all the way behind the seat to the pcb and connected to remote pins of the pcb.
I really do like the foot switch, because it can be moved a bit to drivers preferred position and you do not have anything else to do with your legs… Especially with cvx 
True, in my case i just printed a little Box for a Button, and i mounted it on the Command Arm
I think these are the right connectors for the WAS.
Yes, that is the type of connector, but be sure to check the “coding” of it is right. There is variations of how the spikes/grooves are positioned around the outside of the connector.
Rainy day so used the time to poke around warehouse and found the connector kit I bought from Finnish online store. The box had a website and part number in it’s label.
Connectors for case IH puma, new holland T7 WAS harness:
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could you put a picture of the bridge you made in the was?
Photo of the wiring:
And location in the tractor:
The signals is just soldered together. Unfortunately my brother used wrong wire color and therefore it doesn’t look so professional 
Thank you very much, I am still waiting for pieces to complete the pcb, I hope that before the fall sowing I have it ready.
I think you will need wire gnd too for diferential mode
Are you sure? As I understand it, the ground is everywhere, all the same ground and there should not be a need to wire it to ecu as it already has it. Besides @Larsvest got it working just by wiring the signal to aog pcb, so basically the other way around.
Or did I misunderstand what you mean by differential mode?
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Ground IS not really thé same on all point in tractor. For expérience, its still better to wire a ground référence. Just wire thé sensor gnd to low pin on pcb and choose diferential mode. It Can work without but if u take Time to make your wire way, u will not take more Time for 1 wire more from was
So, I do have conneted the groud and sense low together with a jumper in the pcb
See the kaupoi pcbv4 schematic :
From the pcb the wiring continues with three wires to was. In the wire harness, where this Y cable is I have divedied the signal only to go to different ecu in tractor, so the automatic front diff lock ability continues to work. This is just specific to these cnh machines, not related to ago.
You are correct, gnd should be connected from WAS to PCB was low, and you should use differential mode, if WAS is powered from tractor ecu.
I ought to do so on the T6, but as mentioned above it works anyway.
FiveFinnishFarmers power 5v and gnd from PCB, so differential mode is not necessary. Also because he made the Y cable opposite as me, and only connected signal to tractor ecu.
And to make clear : when I some day are going to redo the wiring on the T6, then I will certainly follow FiveFinnishFarmers wiring 
@FiveFinnishFarmers @Larsvest your notes and info for installation in Case/New Holland was very good and just worked easy as including the A0 pressure sensor in AgOpen 
.
What GPS type are you both using? Where is your Antenna mounted? And do you have the saved vehicle file from AgOpen?
Thanks
Happy you could make it work. I am using a F9p with antenna ann-mb-00, placed on the original GPS metal plate on tractor roof. I don’t have the files here, and they would also still be ver 4