the analog speedo is gps calibrated so I know it is pretty much bang on, I do have the owners manual and will try to adjust it again and I will double check that cross over wire, (maybe just make a new one and see if that helps)
Yes they share a paddle wheel, not sure if that is the norm or not.
my goal is this weekend to get it dialed in! dont really need it for surfing but would be nice to have when all weighted up for wakeboarding.