As the diameter is larger be careful with the caliper to wheel clearance. Some wheels won't clear the caliper.
So have I.... I had to swap the caliper as the std unit wouldn't clear the mag marchesini. It did clear the ali marchesini though.
I'm going to use a bracket for the speed sensor mounted off the caliper mount bolts. Bike Sport Developments supply them, though I will fab my own in the first instance. No need to make any changes to rear disc set up using bracket it seems.
That alloy bracket is the one that Translogic (used to) supply with the dash, it's the same one I'm using on mine. I did intend to replace the 2 nuts with an alloy spacer but never quite got round to it.
Interesting - I was going to ask the very same thing. So, I need a caliper hanger from an 848/1*98 and a disc obviously. Just as well I have the cheepo wheels too ;-)