Well it been just over a year, but I have sucessfully, sold the GT40, and installed PCM 343CAT engine. Now I am trying to find the final pieces to install ZO. I have found a few 5" ZO display units , but I don't necessarily want to cut the dash up for that. I am hoping to find a gently used or new 3.5" ZO head unit for a reasonably price. Please let me know if anyone knows of anything available? I may have this boat for sale soon. It has a new Bimini cover, PTM mirror, new steering cable, and the new engine.