If your doing the page 25 steps right and IF your building the Tamiya Pershing and I believe you are: you must move the appropriate trim tab to the down position, then use the machine gun stick, are you doing that? OK then, if you are and it isn't working, reset your DMD Units per the instructions and you should be good to go. If by chance you have plugged either device into the WRONG position, there is a possible chance you have killed them.

Your going to need to do more research for your build. Your stumbling over the Tamiya Pershiing issues that have been discussed for several years now in this forum. The Pershing turret does not work well without modifying the turret rotation unit. Perhaps Bob from ETO or another Tamiya expert will join in and explain the stuff you should do and why. If you still need tips, email me Monday and I will email explain how to get good Tamiya Pershing turret rotation performance and better main gun elevation operation etc etc.

John