 
          
            8.0 Install speaker into fuel tank and
          
        
        
          
            route wires up right front channel
          
        
        
          Now things are moving quickly. The next step is to mount the
        
        
          speaker into the fuel tank relief. I selected a speaker from
        
        
          another Model Railroad Hobbyist sponsor, Railmaster Hobbies
        
        
        
        
        
          . It is a 14 x 25 mm unit with its own
        
        
          enclosure – DS1425-8. The speaker enclosure is just a bit lon-
        
        
          ger than the fuel tank boss on the frame.
        
        
          Put some caulk in the bottom of the relief and then position
        
        
          the speaker front to rear so that an equal amount of the enclo-
        
        
          sure extends beyond the boss on each end.
        
        
          It would be best if you set this aside for overnight or for a few
        
        
          hours to cure. If you must press on right now, keep checking
        
        
          back that the speaker enclosure hasn’t shifted as you work.
        
        
          Figure 23 was taken after the trucks were wired and the wires
        
        
          secured per step 9. At this time you wouldn’t have the Kapton
        
        
          
            22
          
        
        
          22: Decoder channel insulated with Kapton tape.