My Sherman wasn't accurately registering hits as well as my t34. The photo on the right ((TBU LED on top of gun barrel) shows an arrangement that didn't work well. The photo on the left (TBU LED on the bottom of the cannon) shows my current installation. A very simple modification that allows my Sherman to work as well as my t34, accurately registering hits from past 20 yards. But, in the most recent battle, my t34 suffered some injury. Stay tuned!