Hi.
I'd put a Soundtraxx TSU-2200 in it.
I'd hardwire it inside the tender.
I've done several of my On30 locomotives that way.
If you can follow a wiring diagram, and know how to solder, then it's a pretty easy job.
The tender should have a built in speaker enclosure in it.
You just need to figure out which speaker fits your tender best.
I use a Soundtraxx 28mm 8ohm 2 watt speaker such as this one currently available on Ebay:
https://www.ebay.com/itm/402411693475?
This should fit your tender.
As far as the missing parts are concerned:
If they're not available on this website, then your best hope will be Ebay.
Good luck!
Mike
I'd put a Soundtraxx TSU-2200 in it.
I'd hardwire it inside the tender.
I've done several of my On30 locomotives that way.
If you can follow a wiring diagram, and know how to solder, then it's a pretty easy job.
The tender should have a built in speaker enclosure in it.
You just need to figure out which speaker fits your tender best.
I use a Soundtraxx 28mm 8ohm 2 watt speaker such as this one currently available on Ebay:
https://www.ebay.com/itm/402411693475?
This should fit your tender.
As far as the missing parts are concerned:
If they're not available on this website, then your best hope will be Ebay.
Good luck!
Mike