We have 2 lever controls on our boat, which had Yanmar 1GM. When we acquired our boat, the shift lever appeared to function normally, with forward pointing forward. I came to find out when I had the tranny re-built that the shift bracket on the bell housing was actually installed upside down, with that shift bracket pointing down. I believe it was the original part, and it was able to be installed upside down. So the cable actually was installed backwards, causing the shift bracket to function the opposite way than would be expected. I was told that there was something about the room in the Edson pedestal that made it impossible (or very difficult) to attach the cable in the pedestal to the shift lever correctly, and the solution was simply to reverse the orientation of the shift bracket on the bell housing and install the cable backwards. By putting the shift bracket upside down on the bell housing, the whole operation was set right.
It doesn't seem to make sense, but when I saw how the shift bracket functioned on the bell housing, I could see how the intended solution actually worked!
However, when I got my re-built tranny, with the shift bracket installed correctly, as shown in the installation manual, the cable was still backward in the pedestal. I had to get used to pulling back for forward and pushing the lever forward for reverse. I was told that they couldn't change the cable in the pedestal. Oh well, I just got used to it.
BTW, when I installed the new Yanmar 2YM15, the result is the same. I'm still pulling the lever back for forward. The shift and throttle levers and cables are the only components that I didn't change out with the new installation. I guess it is 2nd nature to me now. Also, the yard guys don't seem to find it weird at all. It seems that they have seen this before.