Speed Passion GT2 questions

[F1END]

Just got one of these and wanted to know about the LCD programming card.

1. What does it do that the one that come with it doesn't?
2. Am I right in thinking the Hobbywing programmer will work with this speedo?
3. Do I really need one?
4. Can anyone recommend a set-up for a Cougar SV2 running a 7.5 Motor on astro?

Thanks,


Hamish