As Tinley implied, lots of long established LPG bits / brands seem to have recently been rebranded as Tomasetto, I wasn't aware of this with the Zavoli reducers though, last time I bought one was probably early this year and was branded Zavoli.
For the temp sensor you might as well follow TT' and Gilbert's advice. I expect the brass bit is just a thread adaptor, if it's just in the location of a water temp sensor it won't cause any harm to the reducer to remove it anyway.
If your previous reducer solenoid was attached directly can you use that one's male/male adaptor?
The solenoid in your pic looks like the type that has 8mm inlet and outlet? Shiny chrome outlet and shiny nut at the opposite side of the solenoid? If so you can slacken the nut from the outlet and the solenoid will rotate around the shiny bits to allow orientation of the solenoid and it's inlet. 8mm Pipe fittings use 12mm thread.
Your reducer is listed as having 6mm pipe inlet, 6mm pipe fittings use 10mm thread.
Obviously if the solenoid has 12mm thread and reducer 10mm thread, to connect your solenoid directly to the reducer you'd need an M12/M10 male/male fitting. Male/male fittings come in a couple of lengths, you should really use the longer length with the shiny bits type solenoid because that type of solenoid valve has deep threads. I generally use a bit of gas paste when using a male male adaptor with this type of solenoid too.
Of course, if you have to go from 8mm pipe fitting on the solenoid to 6mm pipe fitting on the reducer, some type of adaptor would be necessary anyway even if you mounted the solenoid remote of the reducer. Easy enough if you had a few bits around, e.g. could just use a short length of 8mm equivalent Faro pipe with 6mm copper equivalent fitting on one end and 8mm copper equivalent fitting on the other but this probably won't help you! However, won't your existing solenoid and male/male adaptor work with the new reducer, or if you want to use the new solenoid won't the existing male/male adaptor work with the new solenoid?