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I didn't read all the post yet but was wondering about the steering wheel setup.
What wheel and adapter did you use ?
The steering wheel I believe was a 300mm diameter hi-rise, you can get 320mm too. It came with the quick release collar and hub and I asked for a Mitsubishi spline... It did not bolt on. Took a chance there but it seems a Mitsubishi tractor steering shaft is larger than a Mitsubishi car.... , so I bored out the splines on the hub and had new ones cut. Had a friend do the work on the hub for me, but you may be able to find the right spline count. I can't remember the spline count right now, 27 or 29? Sorry, I did this mod last August, steering wheel was ordered on Ebay.