Am, the lucy has a low water pressure switch if that help. *Ive got a wiring diagram for her (from a fellow CSer) and the silvia wiring diagram with no water level switch. *Shouldnt be too different and just a case of bypassing the switch.
Looks like a fun project. *Maybe sourcing another tank would be cheaper, mind you Im starting to think about ditching the tank on Lucy. *The thing always runs out of water mid shot!!!
PS. *What do you do with all these coffee machines after you fix em up?
Oh and just to add I think it looks like a repair to me. Not much else can go wrong if its got a new pump and the boiler is okay... not that im an expert. Reduce Reuse Recycle I say.