DSGDDR Santa Fe 2900 Series 4-8-4

[TplMeads]

Guys, I apologize for bumping a necro with what may be a daft question.

Question: how do I keep from running out of water?

So far I have successfully avoided playing fireman in TSC, but this awesome loco leaves me no choice but to delve into the aforementioned black arts.
I've tried every possible knob and lever in the cabin. I've searched the internet and YT. Fan Railer has a few videos about this loco, but it is not evident to me what he does to maintain the water level. I'm at a loss. Any help would be greatly appreciated.
Thank you.

[AmericanSteam]

Having the same running out of water issue. I am wondering if it is associated to the ongoing scripting issues? I am waiting until the next update to see how it all plays out.