You have to buy a KT LCD separately, whichever one you prefer. The LCD3 is good. this is from the same seller.
I've never used one of these at 52V, but I've heard about guys that use them. Remember that the low voltage cut-off will be too low. you can increase it a bit in the parameter C12, but it will still be too low. Also the battery indicator bars on the LCD will be higher than what the battery is, though you can set the LCD to show voltage as well.
[/QUOTE]
I use one of these on my 52v/2000W bike. Seems to work fine.