if it is a newer model 4-8-4 they already do have tender pickup.

Kato may have neglected the mid phase SD40 but bachmann will never have a product that would ever come close to the quality of a kato locomotive.  I have high praise for the Bachmann spectrum steam locomotive line but my faith in their diesels will never be high.

If you are familiar with the TSU-1000 you would know that your would save lots of space in the tender, the decoder is much longer than a micro-tsunami.  The rear light and some of the other parts of the board get in the way in the back and if you try to position it toward the front the wire harness plug gets in the way.  Neverthe less I got it figured out and hooked up and it sounds and runs like a dream.  I will post a youtube video as soon as I get a chance.   Thanks for the response.

I am going to install a soundtrax TSU-1000 southern steam sound decoder into my class J.  I know the TSU-750 is a better fit but I want the authentic class J whistle.  My problem is that in order to fit it in the tender I have removed the PCB board in the tender and have begun hardwiring it to the wires from the harness that runs into the locomotive. I got all of them hooked up but 2.  the attach to  two screws in the locomotive that receive current from the engines split frame.  Do I solder these wires to the adjacent tender pickups?  If not what can I do with them.  I know they are important.