No problem with legality, for the SVA you'd have to check how it was lit at night. It says "Bright White Backlit LCD Display" for the SVA the illumination must come on with the vehicle side lights, some of these units light up by pushing a button on the fascia.

I'd also be a little worried that the sensors might not work with your particular engine, they seem (From the listing) to be motorcycle model specific.

Good price if it works though.

Cheers

Chris