Hotwire Wiring questions

Riddler said
d. Blue – Brake light output to rear brake lights. - Needed? Why
e. Purple – Backup lamp output to rear backup lamps. - Needed? Why

I believe these are for automatic swaps.

i. Green – Speedometer output to gauge. - OK, but can I use the output from the Viper T56?

Yes, if you are using a compatible (5v electronic signal) speedometer.
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That didnt work like I thought it would. Expand the quote to see where I made comments.

It would be nice if they included some tips for the installation. Its all about figuring out what the Hotwire harness is controlling and what the vehicle harness is controlling.