After reading the posts and gave it some time to think. I remember when I was working on my sherman pershing hybrid I ran into a similar issue. Like what Crius said HL recently upgraded their electronics and the two systems are not compatible. On my build I used the hull of the new system but the turret was an older unit. It's been awhile and I'm a little hazy but I remember I had to make a change to the wiring on the turret to adapt it to work with the one in the hull. Regrettably I don't recall what I changed or where I changed it but it was fairly easy from what I can recall and after the mod the system worked like a charm. Hopefully someone else can chime in here with something more substantial.