Re: Rossa Multi-way Connectors
The ones used on my Spyder are fairly basic and not waterproof so any multi connector would be an improvement. I recently used econoseal on my Locost and found them easy as long as you have the right crimper and seem pretty good. They come in lots of different sizes but for example a 10 way:
https://www.ebay.co.uk/itm/133662228426A suitable crimper:
https://www.ebay.co.uk/itm/304366707758 These crimpers have a two level stepped crimp jaw so the smaller bit crimps the wires and the larger step crimps the seal and insulation all in one squeeze. Much better than the type that you'd use on the insulated crimp terminals.