Thank you for the kind words.
There will be a speedo cable extension with a male end (just like the thread on the speedo housing.) The other end of the cable will be the large nut on it that will screw onto YOUR speedo housing. You will transfer your housing and gear from your existing trans into this one.

The backup switch is located under the front of the sidecover near the drain plug. It takes a stock Mopar switch. Your factory harness and plug will reach and work with no problem.
Thanks,
Jamie