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Yep the big space should be there for the Cytron motor driver. The schematic is a wiring diagram so not really a true layout.
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If you plan to go hydraulic to the best of my knowledge you can still go with a Cytron, IBT-2 is another option.
3a) I believe you want the Spark Fun version as that’s the one that fits on the board. Take a look at @darrenjlobb 's video.
3b) best WAS for 4WD check with @Apm (Andrew Martin) there are also some install pictures on the combine forum. I don’t think that you really need a special one so long as you can make it use the full range of motion.
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Yep a wire works. I used a clipped leg off a diode or resistor.
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I’m not sure what that is. That’s found in the component list and not the parts list. I think you can ignore that.
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Yep you’ll need Part 1212-1002ND That’s what the Opto-Isolators/couplers plug into. 3 of them I believe.
Part A135912-ND is a 7 position screw terminal and that’s where you can connect your WAS etc. You could replace these with pins if you wish.