The switch is a 3 Terminal SPST 2 Position Rocker Switch:
https://www.amazon.com/gp/product/B071KTQ2F5/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
The wire splicers came from my tool box in the basement, no doubt left over from a brief car audio hobby back in the day. You could use any wire splice or wire nut with jumper that would work for you.
I'm yet to use this during a brewday, but I've been spot checking voltage/amp draw with a multimeter. There is no voltage drop on the Alarm/Aux output.
It is a Mager brand SSR, I didn't upgrade any of the internal components. So far, with my limited testing, this seems like a solid unit. I scored it on Amazon during and Inkbirk promo and got an additional discount. I figured for $60, it couldn't hurt to play around with for use as a RIMS controller. I;v tired of babysitting the propane burner doing step mashes and its only going to get worse with the cold weather coming.
Now I just need to wait for RIMS tubes to come back in stock at Brew Hardware and I will be set to test everything out.
Let me know if you have any questions. It really was easy to add the switch.