Ok thanks, I’d be looking to use a sw900 display and then I could just buy an additional 48v controller
May I suggest you look at the KT range of controllers and display options (ktlcd-1, ktlcd3, ktlcd4, .......) ktlcd3 and ktlcd10 are both similar in form to the sw900 iirc.
The controllers have more configuration options, than most giving you options further along to change things come in the standard silver box format and others like in tube or in battery base.. As well as being available in dual voltage options in the silver box format.
One gotcha to watch for is some sellers advertising the cheaper square-wave controllers without making the distinction, they still work just the same but the motor may be louder and jerky when run slow?..