The “350E” Kit is designed to convert your TH350or any other mechanical “Gm” type transmission to an electronic speedometer. This is used when your vehicle has an electronic factory speedometer and your transmission was converted to a gear driven type speedometer. This kit consists of a 8 pulse generator that mounts to the transmission speedometer gear housing and an electronic ratio adapter to adjust the signal. Can be used to drive a speedometer cable at the same time. Will also work with any 7/8 mechanical speedometer gear housing such as Th400 or 700r4.