****DISCONTINUED BY DAKOTA DIGITAL**** The replacement part is the SGI-100BT
The Dakota Digital SGI-5E will allow you to use your factory speedometer with a simple 5-wire install. This box installs in minutes and will convert your T56 Magnum speed sensor over to work with most all factory speedometers.
In this video, starting at the 8:30 mark I cover the wiring for the SGI-5E.