Yea a L4212 is a Grey market unit, being that your in New Zealand that probably doesn't mean much to you.
To sum it up, those tractors were never meant to be shipped or sold outside of mainland Japan, and because of that very little info or written materials are available.
If you can get the model number off the engine (it will be stamped on an upwards facing flat spot just to the side of the injection pump), I then can use that to give you at least some info.
Now as far as controls, that has a unique transmission that was made by by a third party so watch videos to get any info you can.