Yes it should be working
my version 0 pcb works with the new arduino code.So defintiely it will work.
Could it be possible to add an option to use u-turn relays through autosteer module?
I would also be interested in activating two or three relays for controlling the tractor, so it would be more interesting to have them on the autosteer card. tool commands would be on a different card
You can send the machine pgn to autosteer, so build away! Just enable it in Arduino Settings. I think we may as well release v4, everyone is using it anyways lol
cool I activated a general cut-off relay on pin 5 of the pcb as I did on the old version 
Great! What arduino pins are used to control uturn relays?
I have one setup with uturn relays that works great with AOG v3.0.9. It uses pins A2 and A3, as default in coffeetrac Autosteer_button.ino.
Do I need to make changes to my hardware to keep these relays working?
You should only need to change the firmware to turn those pins on/off
By firmware I guess you mean INO-file? I did some testing with v4.1, but couldnāt get uturn relays to work. I enabled āTo Auto Steer: Machine PGNā, but there is no action at āModule Info: UTurnā.
How should I change the INO to get uturn relays to work on auto steer nano pins A2 and A3?
Edit: Managed to get some āactionā to module info: uturn, so aog is sendingā¦
You have to write the code for uturn. there is none.