Ok, think I've figured out the solenoid, will be ordering after payday... But here's my next question... Seems like there are always more questions! lol. Sorry if any of them come across pretty stupid...
The reg that I got looks like this in the pic:
And in case that doesn't work, It's ebay item number: 300664732392
So it looks like it doesn't come with the stem or the nut to connect to the tank, which is just as well really, as I will need to buy that anyway, but since the stem isn't on it, can I just buy any CGA 320 nut/nipple and just screw the nipple into the reg where it's normal stem would go? Or is there a different thread pattern I need to worry about?