700R4 Mechanical to Electronic Speedo Conversion

[Kiko]

I have a 700R4 that has a cable drive for the original mechanical speedo. I'll be changing my original guages to electonic AutoMeter guages, including an electronic speedo.

I know that you can get a pulse generator that screws into the original mechanical cable take-off position, but I'd like to make it clean and replace that unit with an electronic sender. How can I do that? What parts do I need? Will I have to take the transmission out?

Thanks in advance,
Andry